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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 (in km/h) must be increased by


1. 12
2. 18
3. 15
4. 24

1 Answer

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Best answer
Correct Answer - Option 2 : 18

Given

The car can finish a certain journey in 10 hours at the speed of 42 kmph

Formula used

Speed = Distance/Time

Calculation

Total distance covered by car = 10 × 42 = 420 km

Next, the distance should be covered in 7 hours

⇒ New speed = 420/7 = 60 km/hr

∴ Speed of car must be increase by (60 - 42) = 18 km/hr

 

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