Question

a car moves with speed 40km/hr for first hour then with a speed of 30km/hr for next one and a half hour calculate the average speed of the car.
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Answer 1

Explanation:

Distance covered in half an hour at 30km/hr = s×t = 30×1/2=15km. Distance coveted in 1hr at 25km/hr= s×t= 25×1 =25km. Total time taken= 3hrs and 30 mins=7/2 hrs. Therefore, average speed=total distance covered/total time taken = 120×2/7 = 34.28km/hr.Jul