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Q. |
A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform? |
A. | 200 m |
B. | 240 m |
C. | 280 m |
D. | 320 m |
Answer» B. 240 m | |
Explanation: The train's speed is 54 km/hr, which is 54*(5/18) m/sec = 15 m/sec. The length of the train is Speed * Time = 15 m/sec * 20 sec = 300 m. When the train crosses the platform, it travels the length of the train plus the length of the platform in 36 seconds. So, 300 m + length of platform = 15 m/sec * 36 sec. Solving for the platform's length gives the platform's length = 540 m - 300 m = 240 m. |
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