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A car can finish a certain journey in 10 hours at the speed of 42 kmph. In order to cover the same distance in 7 hours, the speed of the car (km/h) must be increased by :
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- 12
- 15
- 18
- 24
Correct Option: C
Distance covered by car = 42 × 10 = 420 km.
New time = 7 hours
| ∴ Required speed = | = 60 kmph. | |
| 7 |
∴ Required increase
= (60 – 42) kmph
= 18 kmph
