Question 367670
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Hi,
Let x represent the rate of the current
d = r*t Or t = d/r
{{{(12mi/(6mph-x)) = (24mi/(6mph+x))}}}
cross multiply
24*(6-x) =12*(6+x)
12*6 = 36x
2mph = x, the rate of the current

checking our answer
12mi/4mph = 24mi/8mph = 3 hr