SOLUTION: Lumi rides her boat 13km upstream and back in the same period of time. She rides 30km downstream, if the rate (speed) of the current is 5km/h. Find the rate of lumi's boat in still
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Question 1117060: Lumi rides her boat 13km upstream and back in the same period of time. She rides 30km downstream, if the rate (speed) of the current is 5km/h. Find the rate of lumi's boat in still water. Answer by ikleyn(53937) (Show Source):
+ = <<<---=== it is your basic "time" equation
= - =
13*(u+5) = 17*(u-5)
13u + 65 = 17u - 85
65 + 85 = 17u - 13u
150 = 4u ====> u = = 37.5.
Answer. The rate of lumi's boat in still water is 37.5 km/h.
