A train travelling at a speed of 54 km/h can cross a bridge in 15 seconds. If the length of the bridge is twice the length of the train, find the length of the bridge.

75 m
150 m
100 m
125 m

Correct answer: 150 m

Solution

Speed 54 km/h = 15 m/s. In 15 seconds, the train covers 15 × 15 = 225 m, which equals train length + bridge length. If bridge length is twice the train length, then total distance is 3 equal parts, so each part is 75 m and the bridge is 150 m.

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