Solve Math Problem: Time to Fill 425L Tank with Pipes

[sumitsawai]

A tank of 425 litres capacity has been filled using two pipes, the first pipe having been opened 5 hrs longer than the
second.If the first pipe were to
open as long as the second and the second pipe was open as long as the first then the the first pipe would deliver half the
amount of water delivered by
the second pipe;if the two pipes were opened simultaneously,the tank would be filled up in 17 hours.How long was the second
pipe open?
a)10 hrs
b)12 hrs
c)15 hrs
d)18 hrs

 

[tiny-tim]

hi sumitsawai! welcome to pf!

show us what you've tried, and where you're stuck, and then we'll know how to help!

 

[n_kelthuzad]

Thats general algebra. Try to change the problem into values maybe helpful - that's what I do.