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A train is moving at a speed of 132 km/hour. If the length of the train is 110 metres, how long will it take to cross a railway platform 165 metres long?
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- 5 seconds
- 7.5 seconds
- 10 seconds
- 15 seconds
Correct Option: B
When a train crosses a railway platform, it travels a distance equal to sum of length of platform and its own length.
Speed = 132 kmph
| = 132 × | = | m/sec | ||
| 18 | 3 |
∴ Required time
| = | seconds | |||||
| 3 | ||||||
| = | = 7.5 seconds | |
| 110 |
Second Method :
Here, x = 110m,
u = 132 km/hr.
| = 132 × | = | m/sec | ||
| 18 | 3 |
y = 165m, t = ?
using
| t = | |
| u |
| t = | |||||
| 3 | |||||
| t = | |
| 110 |
| = | = | = 7.5 sec | ||
| 10 | 2 |
