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A man travels first 50 km at 25 kmph, next 40 km at 20 kmph and then 90 km at 15 kmph. His average speed for the whole journey (in Kmph) is:
1. 25
2. 20
3. 18
4. 40

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Correct Answer - Option 3 : 18

Concept:

Average Speed = Total Distance/Total time

Calculation:

A man travels first 50 km at 25 kmph

Time taken to travel 50 km = 50/25 = 2 hours

Next 40 km at 20 kmph and,

Time taken to travel 40 km = 40/20 = 2 hours

Last 90 km at 15 kmph

Time taken to travel 90 km = 90/15 = 6 hours

Total distance = 180 km

Total time = 10 hour

Average speed = 180/10 = 18 km/hr

∴ His average speed for the whole journey (in Kmph) is 18 km/hr

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