self Maths Puzzle

Pipe.A full the tank thrice as Pipe B. If two combinedly fill the tank in 36 mins. What s the time taken to fill the tank by B alone?

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self Other Question

A company can give ads in three ways by 3 magazines, 2 tv, 2 radio. But the company chooses 2 magazines 1 tv, 1 radio for ads. Therefore how many ways company gave ads? Value of (1+3+5....+3983)/1992 ?