Question

34. Two pipes P and Q can fill a tank in 3 hrs. and 4
hrs. respectively. If both pipes are opened together,
then after what time, should P be closed so that the
tank is full in 2 hrs. from the start
TTA: 112 Seconds
A) 1 hr. 10 min
B) 1 hr. 15 min
C) 1 hr. 20 min
D) 1 hr. 30 min​

Answer 1

Answer:

1 hrs 20 min is the answer of this question