Problema Solution
julie and eric row their boat (at a constant speed) 45 miles downstream for 5 hours, help by the current. Rowing at the same rate, the trip back against the current takes 9 hours. Find the rate of the current.
Answer provided by our tutors
let the rate of current = x
let the speed = y kms
on going downstream:
(y + x) = 45/5
=> y = 9-x
on upstream:
(y-x) = 45/9
=> y=5+x
=> 5+x = 9-x
=> x = 2
rate of current = 2 miles/hour