Question 378925
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Hi,
D = r*t OR t = D/r  Question sets up a "same time" equality:
Let c be the rate of the current:
Write as we Read
{{{5/(6mph-c) = 10/(6mph + c)}}}
cross multiply to solve for c
5(6mph+c) = 10(6mph-c)
30mph + 5c = 60mph - 10c
15c = 30mph
c = 2mph is the rate of the current