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Two trains, each of length 125 metre, are running in parallel tracks in opposite directions. One train is running at a speed 65 km/hour and they cross each other in 6 seconds. The speed of the other train is
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- 75 km/hour
- 85 km/hour
- 95 km/hour
- 105 km/hour
Correct Option: B
Total length of both trains = 250 metres
Let speed of second train =x kmph
Relative speed = (65 + x) kmph
| = (65 + x) × | m/sec | |
| 18 |
| ∴ Time = | |
| Relative Speed |
| ⇒ 6 = | |||||
| (65 + x) × | |||||
| 18 | |||||
| ⇒ 6 × | × (65 + x) = 250 | |
| 18 |
| ⇒ 65 + x = | |
| 5 |
⇒ 65 + x = 150
⇒ x = 150 – 65 = 85 kmph
