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A train 180 metres long is running at a speed of 90 km/h. How long will it take to pass a post ?
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- 8.2 secs
- 7.8 secs
- 8 secs
- 7.2 secs
Correct Option: D
Speed of train = 90 kmph
| = |  | 90 × |  | m/sec. | |
| 18 |
= 25 m/sec.
When a train crosses a post, it covers a distance equal to its own length.
| ∴ Required time = | |
| Speed |
| = | = 7.2 seconds | |
| 25 |
