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Two cars start together in the same direction from the same place . The first goes with a uniform speed of 10 km/h . The second goes at a speed of 8 km / h in the first hour and increase the speed by `1/2` km each succeeding hour .after how many hours will the second car overtake the first , if both go non - stop ?

A

9h

B

5h

C

7h

D

8h

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