Question

pipe A can fill a tank in 5hours and pipe B can empty it in 4hours. if both pipes are opened at the same time,when will the tank be full______

OPTIONS: 5 hours,
4 hours
9 hours
3 hours

plsssssss plsss help​

Answer 1

Answer:

actually your question is wrong because empty time is less then filling time so if both pipes are open at the same time tank will never be full. because pipe B can empty more water then pipe A can fill.

Step-by-step explanation:

I solve this question by takin Pipe A can fill a tank in 4 hrs and pipe B can empty a tank in 5 hours

A can fill a tank in one hour = 1/4

B can empty a tank in one hour = 1/5

If both pipe are open at the same time then water will remain in one hour = 1/4 - 1/5

= 1/20

So, if both pipes are open at same time the water remain after one hour is 1/20

therefore it takes 20 hrs to fill the tank.

I hope it will help you some.