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A car driving in the morning fog passes a man walking at 4 km per hr. in the same direction. The man can see the car for 3 minutes and visibility is upto a distance of 130 metres. Find the speed of the car.
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- 7.5 kmph
- 6.6 kmph
- 6 kmph
- 7 kmph
Correct Option: B
Distance covered by man in 3 minutes
| = |  |  | × 3 minutes | ||
| 60 | minutes |
=200 metres
Total distance covered by the car in 3 min.
= (200 + 130) m = 330 metres
| ∴ Speed of the car = | m per min. | |
| 3 |
= 110 m per minutes
| = | |||
| 1000 | |||
| 60 | |||
| = | km per hr. | |
| 5 |
or 6.6 kmph
