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A car travels 120 km in 2 hours and the same distance in 3 hours on return. Find the speed in still air.

1. 48 km/h
2. 50 km/h
3. 60 km/h
4. 40 km/h

Correct answer: 50 km/h

Solution

The speed in one direction is 120/2 = 60 km/h and in the return direction is 120/3 = 40 km/h. For such problems, the speed in still air is the average of the two speeds: (60 + 40)/2 = 50 km/h.

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