SOLUTION: A boat can travel 48 mph in still water. If it travels 156 miles with the current in the same length of time it travels 132 miles against the current, what is the speed of the curr

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Question 856429: A boat can travel 48 mph in still water. If it travels 156 miles with the current in the same length of time it travels 132 miles against the current, what is the speed of the current?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
Boat speed = 48 mph
current speed = x mph

speed against current 48 - x
speed with current 48 + x

Distance against current 132 miles
Distance with current 156 miles

t=d/r time against = time with current -
132 / ( 48 - x )= 156 / ( 48 + x )
132 ( 48 + x )= 156 ( 48 -x )
6336 + 132 x = 7488 - -156 x
156 x 132 x 7488 + -6336
288 x = 1152
/ 288
x = 4 mph current speed