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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Answered by
1
0.05/ 0.0214285714285714
pepper:
please tell its method
but i dont think its sure corect.
yes i it is incorrect because in our book its answer is 132
Answered by
1
circumference of wheel is 15 m. when it makes 7 revolutions, it travels a distance of 15*7=75m. so this distance is covered in 9 seconds.
hence speed of train=75/9 m/s
=75*3600/9*1000 km/h
=25*1.2 km/h
=30 km/h.
hence speed of train=75/9 m/s
=75*3600/9*1000 km/h
=25*1.2 km/h
=30 km/h.
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