A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottoms. If the cistern is full, the leak will empty it in ?

A 28 hrs
B 20 hrs
C 40 hrs
D 36 hrs

Correct Answer: 40 hrs

Let, The leak will be empty = x hours ATQ, 18 - 1x = 110⇒1x = 18 - 110⇒1x = 5 - 440⇒1x = 140 hrs 
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