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Two trains are moving on two parallel tracks but in opposite directions. A person sitting in the train moving at the speed of 80 km/hr passes the second train in 18 seconds. If the length of the second train is 1000 m, its speed is
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- 100 km/hr
- 120 km/hr
- 140 km/hr
- 150 km/hr
Correct Option: B
Let the speed of second train be x m/s.
| 80 km/h = | m/s | |
| 18 |
According to the question
| = 18 | |||||
| x + | |||||
| 18 | |||||
⇒ 1000 = 18x + 400
| ∴ x = | m/s | |
| 18 |
| = | × | km/h = 120 km/h | ||
| 18 | 5 |
