Discussion :: Problems on Trains
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Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 metres, in what time (in seconds) will they cross each other travelling in opposite direction?
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Answer : Option B
Explanation :
| Speed of the first train = |  | 120 |  | m/sec = 12 m/sec. |
| 10 |
| Speed of the second train = | | 120 | | m/sec = 8 m/sec. |
| 15 |
Relative speed = (12 + 8) = 20 m/sec.
 Required time = |  | (120 + 120) |  | sec = 12 sec. |
| 20 |
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