Problema Solution
Stan can load his truck in 24 min. If his brother helps him, it takes them 15 min to load the truck. How long does it take Stan's brother alone?
Answer provided by our tutors
1/24 + 1/x = 1/15
1/x = 1/15 - 1/24 = (8-5)/120 = 3/120 = 1/40
x = 40 min