a trai crosses a pole in 12 sec and a bridge of length 170 m in 36 sec.Then the speed of the train is?
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Train crosses a pole in 12 sec. it means train crosses its own length.
i.e. train covers 160 m in 12 sec.
So the speed of train = 160/12 = 40/3 m/s
In km/hr, 40/3 * 18/5 = 8*6 = 48 km/hr.
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