2 pipes function simultaneously the reservoir will be filled in 12hrs. One pipe fills reservoir 10hrs faster than other. How many hours does the faster pipe take to fill the reservoir? Choose the correct choice.
A) 10	B) 20	C) 22	D) 24	E) 26
1/x + 1/(x + 10) = 1/12   x = 20   20
<result>B</result>
2 pipes function simultaneously the reservoir will be filled in 12hrs. One pipe fills reservoir 10hrs faster than other. How many hours does the faster pipe take to fill the reservoir?