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Q.

A horse rider covers half the distance with 5 m/s speed. The remaining part of the distance was travelled with speed 10m/s for half the time and with speed 15m/s for other of the time. The mean speed of the rider averaged over the whole-time motion is x7m/s. The value of x is _______

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Detailed Solution

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25t=yt=y25v=distancetime=2y(y5)+2t=2x(x5)+(2y25)=507 m/s

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