Question

1. Taps A and B can fill a tank in 3 hrs. and 4 hrs.
respectively. Tap C can empty the full tank in
6 hrs. If A, B and C are opened simultaneously,
then the tank will be filled in
1. 120 min
2. 140 min
3. 144 min
4. 160 min​

Answer 1

Answer:

3- 144 minutes

Step-by-step explanation:

A - 1/3

B - 1/4

C - 1/6

(1/3)+(1/4)=7/12

Now,

7/12 - 1/6

=7/12 - 2/12

=5/12

Reciprocal -

=12/5 hr

=2.4 hr

=144 minutes