A cistern has one inlet, L and one inlet...

A cistern has one inlet, L and one inlet, M. L takes 5 hours to fill the empty tank, when M is not open and M takes 8 hours to empty the full tank, if the tank is two fifth full, how much time will it take to fill the tank completely when both L and M are opened simultaneously? (in hours)

A) 5 hours

B) 3 hours

C) 6 hours

D) 8 hours

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The correct Answer is:

2 . 5 cm

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