Question 62
A train crosses a pole in 12 sec, and a bridge of length 170 m in 36 sec. Then the speed of the train is:
Solution
Let the speed of train be s m/sec and length be l.
A train crosses a pole in 12 sec.
Distance = speed $$\times$$ time
l = 12s ---(1)
A train crosses a bridge of length 170 m in 36 sec.
Total length = l + 170
l + 170 = 36s ----(2)
Put the value l in eq (2),
12s + 170 = 36s
s = 170/24 = 7.08 m/sec = 7.08 $$\times \frac{18}{5} = 25.5 m/sec
$$\therefore$$ Speed of the train is 25.5 m/sec.
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