Question:

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

Updated On: Oct 1, 2024
  • 16.56 km/h
  • 17.89 km/h
  • 26.67 km/h
  • 35 km/h
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The Correct Option is C

Solution and Explanation

Time duration when traveling at a speed of 40 km/h=\(\frac{200}{40}\)=5 hours
and time duration travelling at 20 km/h=\(\frac{200}{20}=10\) hours
Total time=\(10+5=15\space hours\)
So, Average Speed = \(\frac{400}{15}=26.67\space km/hr\)
The correct option is (C): 26.67 km/h

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