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Q.
Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is:
A.
60 gallons
B.
100 gallons
C.
120 gallons
D.
180 gallons
View Answer
Correct choice: C
Explanation:
Work done by the waste pipe in 1 minute = 1 15 −( 1 20 + 1 24 )= 1 15 − 11 120 = − 1 40 115-120+124=115-11120 = -140 [-ve sign means emptying] Volume of 1 40 140 part = 3 gallons Volume of whole = (3 x 40) gallons = 120 gallons.
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