Mr Khanna crosses a bridge in 7.5 minutes at his average speed of 2 km per hour if the grandson cross the bridge in 4 minutes find his average speed in kilometre per hour
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length of bridge= speed(m/s)*time(s)
= 5/9*450 m=250m
time taken by grandson=4min=240s
length of bridge=250m
his speed= d/t= 250/240*18/5
=15/4 km/h
= 5/9*450 m=250m
time taken by grandson=4min=240s
length of bridge=250m
his speed= d/t= 250/240*18/5
=15/4 km/h
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