Question 401544
the river current is 8 mph. a jet ski can travel 34 miles downstream in the same time that it takes to go 18 miles upstream. what is the speed of th jet ski with no current?
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c = 8
j = jet ski's speed
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d = rt
t = d/r
t = 34/(j+c) = 18/(j-c)
34/(j+8) = 18/(j-8)
34(j-8) = 18(j+8)
34j-272 = 18j+144
16j = 416
j = 26 mph