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Question 27
A cistern can be filled in 9 hours. But due to a leak, it takes one hour more. If the cistern is full,in what time will it become empty due to the leak?
Solution
Let say, in x hours that leak emptied the tank.
So, According to question:
(1/9)-(1/x)=(1/10)
or, (1/x)=(1/9)-(1/10)=(10-9)/90.
or, 1/x=1/90.
or, x=90.
C is correct choice.
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