Question

A tank has two different inlets: a and

b. a alone can fill the empty tank in 3 hrs and b alone can do the same in 4 hrs. an outlet pipe is installed which can empty the tank in ‘x' hours if no inlet pipe is open. when inlet a and outlet are opened, it took 4 hrs to fill the empty tank completely. in how much time will the empty tank be filled when inlet b and outlet are opened

Answer 1

the tank will be filled in 1/3 hrs = 3 hrs