General Maths Puzzle Numerical Ability Time and Work

3 pipes A,B,C can fill a tank in 60 min, 30 min, and 15 min respectively.
If all open the same time how long it takes to fill the tank.

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General Other Question

(xn+yn) is divisible by (x-y)
if n is:
a) Even integer
b) Odd integer
c) For all integers
d) Not possible for any real values
1, -1, 2, -3, 4, -7, 6, -11, 8, -15, 14, ----------