A body moving in a straight line covers a certain distance in a way such that 1/5th of time is covered with speed V1 and in the remaining time, 3/4th of remaining distance is covered with speed V2 and 1/4th of remaining distance is covered with speed V3. Find average speed over the entire journey.
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Average speed=total time takentotal distance covered
At the total distance=3x
Time taken to cover first one third(x)
=t1=v1x
Time taken to cover second one third=t2=v2x
Time taken to cover 3rd one third=t3=v3x
Average speed=v1x+v2x+v3x3x=v11+v21+v313.
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