SOLUTION: a boat goes 560 miles downstream in the same time it can go 490 miles upstream. The speed of the current is 7 miles per hour. Find the speed of the boat in still water.
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Question 928890: a boat goes 560 miles downstream in the same time it can go 490 miles upstream. The speed of the current is 7 miles per hour. Find the speed of the boat in still water.
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
times the same
| Cross Multiplying to solve
560(s-7) = 490(s+7)
70s = 3430 + 3920
s = 105mph, speed of the boat in still water (really...)
And checking
560/112 = 490/98 = 5hr
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