6. A motorcyclist drives from A to B at a uniform speed of 40km/hr and returns back with a speed of 20 km/hr. Find the average speed.
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While goingfrom point a to b, Let distance be x
Speed=30km/h
Time=distance/time
=x/30
While coming from b to a,let distance be x
Speed =20km/h
Time =distance/time
=x/20
Average speed=total distance/total time taken
=x+x/x/30+x/20
=2x/3x+2x/60
=2x/5x/60
=2*12
=24km/h
Speed=30km/h
Time=distance/time
=x/30
While coming from b to a,let distance be x
Speed =20km/h
Time =distance/time
=x/20
Average speed=total distance/total time taken
=x+x/x/30+x/20
=2x/3x+2x/60
=2x/5x/60
=2*12
=24km/h
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