SOLUTION: the speed of a stream is 4mph. a boat travels 2miles upstream in the same time it takes to travel 10 miles downstream. What is the speed of the boat in still water?

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Question 121626: the speed of a stream is 4mph. a boat travels 2miles upstream in the same time it takes to travel 10 miles downstream. What is the speed of the boat in still water?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
s+=+4mi/hr = speed of stream
b = speed of boat in still water
2+%2F+%28b+-+s%29+=+10+%2F+%28b+%2B+s%29
2+%2F+%28b+-+4%29+=+10+%2F+%28b+%2B+4%29
multiply both sides by %28b+-+4%29%28b+%2B+4%29
2%28b+%2B+4%29+=+10%28b+-+4%29
2b+%2B+8+=+10b+-+40
8b+=+48
b+=+6mi/hr