Two pipes 3

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

Correct answer:

t =  14.6667 min

Step-by-step explanation:

a=15 min b=20 min  t1=4 min  t1 a1+t b1=1 at1+bt=1  t=b (1t1/a)=20 (14/15)=14.6667 min

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