Problema Solution
A tugboat goes 140 miles upstream in 10 hours. The return trip downstream takes 5 hours. find the speed of the tugboat with out a current and the speed of the current.
Answer provided by our tutors
Let r = speed of boat without current
and c = speed of the current
140 = 10(r - c)
140 = 5(r + c)
14 = r - c
28 = r + c
42 = 2r
21 = r
c = 7
The speed of the tugboat is 21 mph, and the speed of the current is 7 mph.