Question
Mathematics Question on Time and Work
Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time taken to fill the tank?
A
14 min 40 sec
B
12 min 30 sec
C
11 min 45 sec
D
10 min 20 sec
Answer
14 min 40 sec
Explanation
Solution
The correct option is (A): 14 min 40 sec.