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- A cistern can be filled in 9 hours but due to a leak at its bottom it takes 10 hours.
Question 1:
A cistern can be filled in 9 hours but due to a leak at its bottom it takes 10 hours. If the cistern is full, then the time that the leak will take to make it empty will be ?
A. 60 hours
B. 70 hours
C. 90 hours
Feedback Part filled without leak in 1 hour = 1/9
Part filled with leak in 1 hour = 1/10
Work done by leak in 1 hour
= 1/9 - 1/90
We used subtraction as it is getting empty.
So total time to empty the cistern is 90 hours
Part filled with leak in 1 hour = 1/10
Work done by leak in 1 hour
= 1/9 - 1/90
We used subtraction as it is getting empty.
So total time to empty the cistern is 90 hours
D. None of these
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