Question

A cistern can filled by two pipes a and b in 24 min and 32 min respectively both pipes are opened together then after how much time b should be closed so that the tank is fill in 18 minutes

Answer 1

Step-by-step explanation:

SolutionLet N be the closed after x minute. Then,

x{(1/24)+(1/32)} + (18-x)(1/24) = 1

solve

x = 8