DIRECTIONS for the question:Solve the following question and mark the best possible option.
A cistern is filled in 12 hours but takes three hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in:
A)
60 hours
B)
30 hours
C)
15 hours
D)
None of these
A
Let the time taken by leak to empty the full tank = x hours
Given, 1/12 - 1/x = 1/15
Solving, x = 60 hours
