Question

if a train crosses a point in 27/2 sec, moving with a speed of 30 km/h , length of the train is a)112.5 metre, b)132 metre, c)140metre, d) 150 metre

Answer 1

first of all convert the speed into m/s
30*5/18=150/18=8.3m/s
time =27/2s
so the length of the train is 112.05 m
not 112.5m