A horse rider covers half the distance with 5 m/s speed The remaining part of the distance was travelled with speed 10 m/s for half the time and with speed 15 m/s for other half of the time. The mean speed of the rider averaged over the whole time of motion is x/7 m/s. The value of x is
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(50)
In motion BC
x = d 1 + d 2
where d 1 & d 2 we the distance travelled with 10 m/s and 15 m/s respectively in equal time intervals 
each
Ans. : 50
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