A man travels 200 km distance with the s...

A man travels 200 km distance with the speed of 40 m/s and next 50 km with the speed of 10 m/s . Find the average speed of man.

14(2/7)km/hr

14(5/7) km/hr

15.6 km/hr

none of these

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Verified by Experts

The correct Answer is:

Average speed = (200+300+500)/((200/40)+(300/20)+(500/10))=14.2857 km/hr

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