1.

Q: Two pipes A and B can fill a tank in 15 min and 20 min respectively. Both the pipes are opened together but after 4 min, pipe A is turned off. What is the total time required to fill the tank ?

A. 15 min 20 sec.
B. 16 min 40 sec.
C. 13 min 10 sec.
D. 14 min 40 sec.
Answer» E.


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