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Two trains 125 metres and 115 metres in length, are running towards each other on parallel lines, one at the rate of 33 km/hr and the other at 39 km/hr. How much time (in seconds) will they take to pass each other from the moment they meet ?
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- 8
- 10
- 12
- 15
Correct Option: C
Relative speed
= (33 + 39) kmph
= 72 kmph
| = |  |  | m/sec. | |
| 18 |
= 20 m/sec.
| ∴ Time taken in crossing = | |
| Relative speed |
| = | = | ||
| 20 | 20 |
= 12 seconds
