Asked by takeeyah
The speed of a river current is 4 mph. IF a boat travels 20 miles downstream in the same time that it takes to travel 10 miles upstream, find the speed of the boat in still water.
Answers
Answered by
Damon
downstream speed = u + 4
upstream speed = u - 4
20 = (u+4) t
10 = (u-4)t
so
20/(u+4) = 10/(u-4)
10 u + 40 = 20 u - 80
10 u = 120
u = 12 miles/hr
upstream speed = u - 4
20 = (u+4) t
10 = (u-4)t
so
20/(u+4) = 10/(u-4)
10 u + 40 = 20 u - 80
10 u = 120
u = 12 miles/hr
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