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Two trains of equal length, running in opposite directions, pass a pole in 18 and 12 seconds. The trains will cross each other in
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- 14.4 seconds
- 15.5 seconds
- 18.8 seconds
- 20.2 seconds
Correct Option: A
Let the length of each train be x metre.
| Speed of first train = | m/sec | |
| 18 |
| Speed of second train = | m/sec | |
| 12 |
When both trains cross each other, time taken
| = | |||||
| + | |||||
| 18 | 12 | ||||
| = | |||||
| 36 | |||||
| = | |
| 5x |
| = | = 14.4 seconds | |
| 5 |
