Question

3. One tap fills a tank in 20 minutes and another tap fills it in 12 minutes. The tank bei
empty and if both taps are opened together, in how many minutes the tank will
full?
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Answer 1

let the volume of tank is V

now tap 1 fulfill it in 20 min and tap 2 fulfill it 12 min.

it mins in 1 min tap 1 will fulfill V/20 and tap 2 will fulfill V/12.

not late tank will fulfill in x min then,

x(V/12 + V/20) = V

x(20+12)= 240

22x=240

x=10.90

it means tank will fulfill in 10.90 min