Question 68

A car driver travels from the plains to the hill station, which are 200 km apart, at an average speed of 40 km/h. In the return trip, he covers the same distance at an average speed of 20 km/h. The average speed of the car over the entire distance of 400 km is

Solution

Time taken when he travels at 40 km/hr = $$\frac{200}{40}=5$$ hours

and time taken travelling at 20 km/hr = $$\frac{200}{20}=10$$ hours

=> Total time = 15 hours

$$\therefore$$ Average speed = $$\frac{400}{15}=26.67$$ km/hr

=> Ans - (C)

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