r8mon7taRosheyell r8mon7taRosheyell

21-01-2017
Advanced Placement (AP)

contestada

A boat has a speed of 9 mph in cold water. it takes the boat 4 hours to travel upstream but only 2 hours to travel the same distance downstream. which equation can be used to find c, the speed of the current

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foggles foggles

22-01-2017

(1) 9*4 - 4c = x
(2) 9*2 +2c = x

∴ 36 - 4c = 18 + 2c
18 - 4c = 2c
9 - 2c = c
9 = 3c
c = 3 mph

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