Question 808958
s = d / t
t = d / s
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4(miles)/(b + 9) + 4(miles)/(b - 9) = 4 hours
(1/4)(b + 9) + (1/4)(b - 9) = 1/4
(1/4)b + 9/4 + (1/4)b - 9/4 = 1/4
(1/2)b + = 1/4
b = 2/4
Answer:
Boat speed in still water is 0.5 mph
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