1.

A body goes from C to D taking 10 seconds with a speed of 20 m/s and then goes from D to E in 20 seconds with a speed of 30 m/s. The average speed of the body during the whole journey is

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A body goes from C to D taking 10 seconds with a speed of 20 m/s and then goes from D to E in 20 seconds with a speed of 30 m/s. The average speed of the body during the whole journey is




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