# The wheel of an engine 15/meters in circumference makes 7 revolutions in 9 second. find, the speed of the train in km per hour.

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by pepper

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by pepper

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0.05/ 0.0214285714285714

hence speed of train=75/9 m/s

=75*3600/9*1000 km/h

=25*1.2 km/h

=30 km/h.