A person starts with the speed of u/1 kmph and returns with the speed of u/2 kmph, what is his average speed.
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let the distance be X
therefore total distance =2x
time = distance /speed
time 1 = x/u/1 = x*1/u
=x/u
time2 = x/u/2 = x*2/u
=2x/u
average speed = 2x/x/u+2x/u
=2x/3x/u
=2x*u/3x
= 2u/3
hope it will help
therefore total distance =2x
time = distance /speed
time 1 = x/u/1 = x*1/u
=x/u
time2 = x/u/2 = x*2/u
=2x/u
average speed = 2x/x/u+2x/u
=2x/3x/u
=2x*u/3x
= 2u/3
hope it will help
Arooza:
is it correct
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