If the time taken by pipe A is 7 hours more than time taken by A and B together and the time taken by B is 28 hours more than the time taken by A and B together. Find the time taken by A and B together.

14 hours

A → 7 hours more

B → 28 hours more

(A+B)'s time = \(\sqrt {7 × 28}\)

                    = \(\sqrt {196}\)

                    = 14 hours