Timework11

33A train traveling at 42 km/hr. passes a cyclist going in the same direction in 9 secs.; if cyclist had been going in the opposite direction, the train would have passed him in 5 secs. Length of the train is

Option : A
Explanation :
Let L is length of train in km and x is speed of the cyclist, Then
(i) 400L = 42 - x
(ii) 720 L = 12 + x
On adding, we get
1120 L = 84
⇒ L = (84 x 1000)/1120 = 75m

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