Question

A tank can be filled in 12 hours by three pipes a, b and c pipe c fills twice faster as b, and pipe b fills twice faster as a how much time will a alone take to fill the tank?

Answer 1

A+ B+C= A+ B + 2B= A+2A+2x2A=7A

So we can replace A + B +c by 7 A

7A takes 12 days

So A will take 84 days