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Subject :NSO    Class : Class 8

A body goes from point X to point Y with a speed of 10 m s-1. It comes back to X with a speed of 20 m s-1. The average speed of the body during the journey is ______.
(a) 15 m s-1
(b) 16.6 m s-1
(c) 13.3 m s-1
(d) 30 m s-1

how to get answer ?

Ans 1:

Class : Class 9
Add both speeds and divide by 2. (20+10)/2=15 meters per second

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