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Two trains of length 70 m and 80 m are running at speed of 68 km/hr and 40 km/hr respectively on parallel tracks in opposite directions. In how many seconds will they pass each other ?
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- 10 sec
- 8 sec
- 5 sec
- 3 sec
Correct Option: C
Relative speed
= (68 + 40) kmph = 108 kmph
| = |  |  | m/s or 30 m/s | |
| 18 |
| ∴ Required time = | |
| Relative Speed |
| = | | | second = 5 seconds | |
| 30 |
