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Two trains 105 metres and 90 metres long, runs at the speed of 45 km/hr and 72 km/hr respectively, in opposite directions on parallel tracks. The time which they take to cross each other, is
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- 8 seconds
- 6 seconds
- 7 seconds
- 5 seconds
Correct Option: B
Length of both trains
= 105 + 90 = 195 m.
Relative speed = (45 + 72) = 117 kmph
| = 117 × | or | m/sec. | ||
| 18 | 2 |
| ∴ Time taken = | |||||
| 2 | |||||
| = | = 6 seconds | |
| 65 |
