A person covers half of his journey at a speed of 20 kilometre per hour and covers half of a journey at a speed of 30 km per hour find the average speed
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25km/hr it's the answer
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distance travel is same
so speed =d/t
t=d/speed
so
t1=d/20
t2=d/30
so putting all values
average speed =2d/d(1/20+1/30)
=2(20)(30)/30+20
=2 (20)(30)/50
=2 (60)/5
=24
so average speed is 24 Km/hr
so speed =d/t
t=d/speed
so
t1=d/20
t2=d/30
so putting all values
average speed =2d/d(1/20+1/30)
=2(20)(30)/30+20
=2 (20)(30)/50
=2 (60)/5
=24
so average speed is 24 Km/hr
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