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At a certain speed, a car takes 4 hours to complete the journey of 252 km. Time taken by the car to cover the journey, if the speed of the car is decreased by 9 km / hour.

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4 hours 10 minutes

3 hours 40 minutes

4 hours 40 minutes

5 hours 15 minutes

answer is A.

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Detailed Solution

Speed of the car

= \frac{d}{t} = \frac{252}{4} = 63 k m / h

Speed was decreased 9Km/h then speed $=$ 63-9=54Km/h

$∴ t i m e = \frac{d}{s} = \frac{252}{54} =$ 4 hours 40 minutes

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