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A carriage driving in a fog passed a man who was walking at the rate of 6 km per hr. in the same direction. He could see the carriage for 4 minutes and it was visible to him up to a distance of 200 metres. Find the speed of the carriage.
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- 8.75 kmph
- 8.5 kmph
- 8 kmph
- 9 kmph
Correct Option: D
The distance covered by man in 4 minutes
| = | = 400 metres | |
| 60 |
The distance covered by carriage in 4 minutes
= 200 + 400 = 600 metres
| ∴ | × | km per hr. | ||
| 4 | 1000 |
= 9 km per hr.
