John drove for 3 hours at a rate of 50 miles per hour and for 2 hours at 60 miles per hour. What was his average speed for the whole journey?
1. John drove for 3 hours at a rate of 50 miles per hour and for 2 hours at 60 miles per hour. What was his average speed for the whole journey?
Jawab:
Penjelasan dengan langkah-langkah:
(50x3+60x2)/(3+2)
150+120/5
270/5
54
So his avarage speed for the whole journey was 54 miles/hour
Penjelasan dengan langkah-langkah:
average speed = (3x50)+(2x60) / (3+2)
= 270/5 = 54milesperhour
2. bantu jawab yaTwo cars 720 kilometers apart travel toward each other. One car travels 70 kilometers per hour while the other car travelsat the rate of 50 kilometers per hour. In how many hours will they meet?
Jawab:
Bahasa Indonesia =
Dua mobil berjarak 720 kilometer terpisah satu sama lain. Satu mobil melaju 70 kilometer per jam sedangkan mobil yang lain melaju dengan kecepatan 50 kilometer per jam. Dalam berapa jam mereka akan bertemu?
Penjelasan dengan langkah-langkah:
Jarak = 720 kmKecepatan = 70km/jam + 50km/jam = 120km/jamWaktu = J/K = 720/120 X 60 =360 MENIT : 60 = 6 jamBahasa Inggris =
Distance = 720 km Speed = 70km / hour + 50km / hour = 120km / hour Time = J / K = 720/120 X 60 = 360 MINUTES : 60= 6 hourssemoga membantu dan maaf jika jawaban saya salah
3. The time needed to travel a certain distance varies inversely with the rate of speed. If it takes 8 hours to travel a certain distance at 36 miles per hour, how long will it take to travel the same distance at 60 miles per hour?
Fotoooooooooo!!!!!!!!!
4. he drives at a speed of 100 miles per .... houra.no article neededb.thec.ad.an
No article needed. Per hour is correct.
Jawaban:
A . no article needed
Penjelasan:
maaf kalau salah
5. A cyclist is traveling at the speed of 15 kilometers per hour. Find the distance he travels in two hours.Ini Matematika inggris tolong harus kumpul sekarang
JAWABAN
per hour = 1 hour
1 hour = 15 kilometers
2 hours = 15 × 2 = 30 ✅
6. tolong bantuin, yg bisa bantu aku jadiin jawaban tercedas. jangan ngasal yaa. makasii (indo) 1. John mengemudi selama 4 jam dengan kecepatan 60 mil per jam dan selama 1 jam dengan kecepatan 50 mil per jam. Berapa kecepatan rata-rata untuk seluruh perjalanan?(eng)1. John drove for 4 hours at a rate of 60 miles per hour and for 1 hours at 50 miles per hour. What was his average speed for the whole journey?
Jawab:
Penjelasan dengan langkah-langkah:
rata-rata = (60+60+60+60+50)mil/jam : 5 data = 58 mil/jam
7. A train travels with the velocity 15 m / s. The velocity of the train in km/hour is
lanjutan
15×3600 = 54000
= 54000 : 1000
= 54 km/hour
1000 itu dari km ke m
klau 3600 detik sama dgn satu jam
8. A bus travels at 80 km/hour. How far has it travelled after 2,5 hours?
Jawaban:
210 km per 2,5 jam '_'_'_'
Penjelasan dengan langkah-langkah:
sorry
9. A bird leaves its nest and travels 18 miles per hour downwind for x hours. On the return trip, the bird travels 3 miles per hour slower and has 5 miles left after x hours. a. What is the distance of the entire trip? ____miles b. How long does the entire trip take? ____ hours ____ minutes and ____ seconds
Jawaban:
a. 30 miles
b. 1 hour 40 minutes
Penjelasan dengan langkah-langkah:
dari soal diatas, satu satunya yang sama afalh total jarak tempuhnya. dari kejadian awal
s = v x t
s = 18X
dari kejadian kedua
s = 15X + 5
substitusi nilai s
15X + 5 = 18X
3X = 5
X = 1 hour 40 minutes
s = 30 miles
10. 1. in one hour,a car travelling at 70 miles per hour will go a shorter distance than a car travelling at 70 kilometres per hour (jawab betul atau salah)2. 45 miles: km3. 208 km: miles
false/salah. semoga bermanfaat1. True
3. 208 km = 208 × 1.000.000 = 208.000.000 miles
11. An airplane travels 200 miles due west, and then 150 miles 608 north of west. determine the resultant displacement.
Consider X-axis as West - East.
Consider Y-axis as North - South.
The plane starts from O (0, 0).
First it goes 200 miles due West to A (- 200, 0).
Then it goes to B, say (p, q).
So, AB is 150 miles 60° North of West.
So, p - (- 200) = - 150 * cos 60°
Or, (p + 200) = - 150 * 1 / 2 = - 75
Or, p = (- 200 - 75)
Or, p = - 275
And, q - 0 = - 150 * sin 60°
Or, q = - 150 * (√3) / 2 = - 75√3
Or, q = - 75√3
Thus, final location of the aircraft = B (- 275, - 75√3).
Therefore, magnitude of resultant displacement = |√[{(- 275)^2} + {(- 75√3)^2}]| miles = √(75625 + 16875) miles = √92500 miles ≈ 304.138 miles.
And, direction of resultant displacement = arc tan {(- 75√3) / (- 275)} = arc tan {(3√3) / 11} = 25.284° North of West.
i copied this answer from a forum in quora, dont get me wrong. but the end results varies
12. a train running between two stations 50km apart arrives on time if it travels at an average speed of 60 km/h. How late will it be if it travels at an average speed of 50 km/h?
On time :
s=50 Km
v=60km/h
t = s : v
= 50Km : 60Km/h
= 5/6 h
Late :
s=50Km
v=50Km/h
t = s : v
= 50Km : 50Km/h
= 1h
1h - 5/6h = 1/6h
1/6h = 1/6 x 60min = 10min
At an average speed of 50Km/h, the train will be 10 minutes late.
13. a person climbs to the top of a mountain at the rate of 1.5 kilometers per hour and down the same way at a rate of 4.5 kilometers per hour. if he is gone for 6 hours, how far did he travel from camp to the top of the mountain?
Jawab:
6.75 km
Penjelasan dengan langkah-langkah:
Distance climbs=distance down
v1×t1=v2×t2
1.5t1=4.5t2
t1/t2=4.5/1.5
=3/1
Since he gone for 6 hours its mean he climbs and down for 6 hr
So we have t1=3/4×6 hour=4.5 hour
Distance to climbs=v1×t1=1.5×4.5=6.75 kilometers
Sorry for my english and CMIIW
14. A machine puts tar on a road at the rate of 48 metres in 1 hour. How long does it take to cove 1 km of road?
[tex] \frac{48m}{1 hour} =\frac{1.000m}{x} [/tex]
1000 hours=48x
x=[tex] 20\frac{5}{6} [/tex] hours
15. A motorist travels at 45 kilometres per hour. Work out how far he travels in 1 minute. Give your answer in metres.Plis bantu :')
Jawaban:
[tex]750 \: meter[/tex]
Semoga bermanfaat dan maaf jika ternyata jawaban salah dan tidak jelas
16. .the distance between pontianak and singkawang 150 km.A bus running at the speed 50 km/hour.it left the pontianak at 08.00O’clock. What time will the bus reach the singkawang? 2. yesterday,rom drove his car at an average speed of 50 km/h for 2 hours 30 minutes.how did he travelled? 3. A plans cover a distance of 2100 miles at a speed of 700 mph. How long will it take to complete this journey? 4.A truck driver travels for 4 hours and 30 minutes at a constant speed and travels 252 kilometres.what is the speed of the trucks in kilometer per hour ?
Penjelasan dengan langkah-langkah:
1weu idk sydyxgshdjdif
Semoga terbantu. Maaf kalau ada yg salah17. Rate (1) A car can travel 72 km on 6 l of petrol. At this rate, how many kilometres can the car travel on 1 e of petrol? Ans: (2) Susan paid $14 for renting a bicycle for 2 hours. At this rate, how much did Susan pay per hour?
Jawab:
(1) 12 km / liter
(2) $7 /hour
Penjelasan dengan langkah-langkah:
(1) 72 km with 6 liter means 72/6 km/liter = 12 km/liter
(2) $14 / 2 hour = $7/hour
18. inflation......(rise) at a rate of 2% per annum.
Jawaban:
inflation rises at a rate of 2 percent per annum
Jawaban:
inflation rises at a rate of 2 percent per annum
Penjelasan:
19. which statement is incorrect about the speed of these animals?A. a lions runs 10 miles per hour more than an antelope.B. a lions runs 10 miles per hour less than an antelope.C. an antelope runs 1 mile per hour less than a cheetah.D. a cheetah runs 11 miles per hour more than a lion.plis bantu kak...
Jawaban:
a. a lions runs 10 miles per hour more than an antelope.
Penjelasan:
maaf kalau salah
20. 3. A car is travelling at a speed shown in the speedometer below. Which of the following statements is true? a) The car travels 65 km in 1 hour.b) The car travels 35 km in 1/2 hour. c) The car travels 30 km in 1/2 hour. d) The car travels 75 km in 1 hour. Repost soal ini dan mohon jawabin ya jika nada jawabin dengan penjelasan saya akan bikin jawaban nya sebagai brain list.
Penjelasan dengan langkah-langkah:
di gambar soal menunjukkan
angka 70 km/jam =
35km/½jam.
opsiB
Jawaban:
B
Penjelasan dengan langkah-langkah:
70km/ 1 hour ÷ 2
=70km/60 minutes ÷ 2
=35/30minutes
Maaf kalo gk ngerti
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