If two pipes function simultaneously the reservoir will be filled in 12 hours, one pipe fills the reservoir 10 hours faster than the other. How many hours it takes the second pipe to fill the reservoir? Choose the correct choice from the following options.
A) 15 hours
B) 18 hours
C) 30 hours
D) 20 hours
E) 22 hours
30 hours   30 hours
<result>C</result>
If two pipes function simultaneously the reservoir will be filled in 12 hours, one pipe fills the reservoir 10 hours faster than the other. How many hours it takes the second pipe to fill the reservoir?