a car moves with a speed of 30 km per hour for half an hour 25 km per hour for one hour and 40 km per hour for 2 hour. calculate the average speed of the car.
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a car moves with a speed of 30 km per hour for half an hour 25 km per hour for one hour and 40 km per hour for 2 hour. calculate the average speed of the car.
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time = 1/2h
distance = 30 * 1/2 = 15km
speed = 25km/h
t = 1h
distance = 25 * 1 = 25km
speed = 40km/h
t = 2h
distance = 40 * 2 = 80km
total distance = 15 + 25 + 80 = 120km
total time = 3.5h
avg speed = 120/3.5 = 34.29km/h(approx)
Here is your answer..
Solution:-
Distance travelled in half an hours=
Distance travelled in the 1 hrs at speed of 25km/h=
Distance travelled in 2 hrs at speed of 40km/h
Now,
Total time =
Total distance travelled=15+25+80
Since,
Hence,
Average speed =34.28km/h
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