A motorcyclist drives from a to b with a uniform speed of 30 km/h and returns back with a speed of 20 km/h. Find its average speed
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Answer:
consider, distance bw a to b=x
then find going time=x/30
and returning time=x/20
now total dist.=2x
and total time=x/30+x/20=x/12
now average speed=2x/x/12=24
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