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Initially the diameter of a balloon is ...

Initially the diameter of a balloon is 28 cm. It can explode when the diameter becomes 5/2 times of the initial diameter . Air is brown at 156 cc/s. It is known that the shape of balloon always remains spherical . In how many seconds the balloon will explode ?

A

1078s

B

1368 s

C

1087 s

D

none of these

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The correct Answer is:
A
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