A and B working simultaneously can paint a Tank in 5/6 hrs. A and

A and B working simultaneously can paint a Tank in 5/6 hrs. A and C working simultaneously complete the same task in 3/2 hrs, while C and B working simultaneously complete it in 2 hrs. If A,B,and C were to work together how long would it take them to finish painiting the tank?

Now:

1/a + 1/b =   6/5

1/a + 1/c =   2/3

1/c + 1/b =   ½

1/a + 1/b + 1/c =   71/60

Total Hrs : 60/71