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A 200 metre long train is running at a speed of 72 km/hr. How long will it take to cross 800metre long bridge ?
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- 50 seconds
- 40 seconds
- 60 seconds
- 30 seconds
Correct Option: A
Speed of train = 72 kmph
| = |  |  | m/sec. | |
| 18 |
= 20 m/sec.
| Required time = | |
| Speed of train |
| = | |
| 20 |
| = | = 50 seconds | |
| 20 |
