Answers

2014-05-03T20:20:49+05:30
0.05/ 0.0214285714285714
0
please tell its method
but i dont think its sure corect.
yes i it is incorrect because in our book its answer is 132
2014-05-04T11:05:03+05:30
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.
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