Question

The tank is half filled then two pipes are opened together for another 4 hours and they filled the tank. how many hours time does pipe b take to fill the tank if pipe a fill in 12hrs alone?

Answer 1

Answer:

24 hrs

Step-by-step explanation:

let b gets time x hrs.

then in one hour a and b done (1/12 + 1/x) hrs

= (x+12)/12x hrs.

so they done in 4 hrs. is (3+12)/3x hrs

now,

(x + 12)/3x = 1/2

or, 3x = 2x+24

or x= 25