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Two trains, 80 metres and 120 metres long, are running at the speed of 25 km/hr and 35 km/hr respectively in the same direction on parallel tracks. How many seconds will they take to pass each other ?
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- 48
- 64
- 70
- 72
Correct Option: D
Relative speed = 35 – 25 = 10 kmph
| = | m/sec. | |
| 18 |
Total length = 80 + 120 = 200 metres
| ∴ Required time = | |
| Relative speed |
| = | |||||
| 18 | |||||
| = | = 72 seconds | |
| 10 × 5 |
