TCS Company Numerical Ability Permutation and Combination

There are two pipes A and B. If A filled 20 liters in a hour B can fills 40 liters in same time. Likewise B can fill 40, 80, 120,160….if B filled in (1/16) th of a tank in 3 hours, how much time will it take to fill completely?

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TCS Other Question

There is 17 friends (A1,A2,A3....A17).If A1 have to have shake with all with out repeat. How many hand shakes possible? The ages of two friends is in the ratio 3:4. After how many years will the ages be in the ratio 7:8?