Question

URGENT !!
A car travels from A to B at a speed of 30 km/hr and returns at a speed of 20 km/hr. The average speed of the car for the whole journey is:​

Answer 1

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Answer 2

Answer:

If the distance is D km. Then time taken is Distance by speed. So for going it is D/30, and for the return D/20. Thus average speed is total distance by total time. Which is 2D/[(D/30) + (D/20)] = 24 km/hr