Question

One pipe can fill a tank in 3 hours less than the other two. Together can fill the tank in 6 hour 40 minutes find the time it will take to fill the tank

Answer 1

$\sqrt{2428 } + 40 = the \: ans$

Answer 2

6.40

_3.00

______

3.40

second part

6.40

+3.40

_______

9.80. is used to fill the tank