SOLUTION: A motorboat travels 4km downstream in 0.5 h, and travels the same distance upstream in 2 h. Determine the speed of the boat in still water.

Question 812473: A motorboat travels 4km downstream in 0.5 h, and travels the same distance upstream in 2 h. Determine the speed of the boat in still water.
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
s = d / t
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b + w = 4 / 0.5 = 8 kph
b - w = 4 / 2.0 = 2 kph
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b + w = 8
b - w = 2
b = w + 2
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b + w = 8
(w + 2) + w = 8
2w = 6
w = 3
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Answer:
b = w + 2 = 5 kph
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