When both the input pipe A and the outlet pipe B are opened at the same time, how long will it take to empty the tank? I.In 16 minutes, I. A can fill the tank. II. B can drain a full tank in less than eight minutes.
A.I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are necessary to answer
Answer:D
When both the input pipe A and the outlet pipe B are opened at the same time, how long will it take to empty the tank? I.In 16 minutes, I. A can fill the tank. II. B can drain a full tank in less than eight minutes.
A.I alone sufficient while II alone not sufficient to answer B. II alone sufficient while I alone not sufficient to answer C. Either I or II alone sufficient to answer D. Both I and II are necessary to answer
Explanation: 1 minute of filling work by I. A = 1/16II. 1 minute of filling work = 1/8 (A + B) minute of emptying work = 1/8 -1/16= 1/8,In 16 minutes, the tank will be empty. As a result, both I and II are required to answer the question.