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A man standing on a platform finds that a train takes 3 seconds to pass him and another train of the same length moving in the opposite direction, takes 4 seconds. The time taken by the trains to pass each other will be
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2 3 seconds 7 -
3 3 seconds 7 -
4 3 seconds 7 -
5 3 seconds 7
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Correct Option: B
Let the length of each train be x metres
| Then, Speed of first train = | m/sec | |
| 3 |
| Speed of second train = | m/sec | |
| 4 |
They are moving in opposite directions
| ∴ Required time = | + | ||
| 3 | 4 |
| = | = | m./sec. | ||
| 12 | 12 |
Total length = x + x = 2 x m.
| ∴ Time taken = | |||||
| 12 | |||||
| = | |
| 7 |
| = 3 | sec. | |
| 7 |
