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Q.
A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 4 liters a minute into the cistern, and it is emptied in 24 minutes. How many liters does the cistern hold ?
A.
360 lit
B.
480 lit
C.
320 lit
D.
420 lit
View Answer
Correct choice: B
Explanation:
1/k - 1/20 = -1/24 k = 120 120 x 4 = 480 Therefore, the capacity of the cistern is 480 liters.
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