I am stuck on this questions:
A certain tank can be filled by two pipes in 80 minutes. The larger pipe by itself can fill the tank in 2 hours less than the small pipe by itself. How long does each pipe take to fill the tank on it's own?
My attempt so far:
Large pipe = l
Small pipe = s
time = t
(Large pipe + Small pipe) x time = 1 filled tank
I still have the s in the answer? how am i suppose to calculate t?