Nancy H.
asked • 04/15/23word problem algebra
the current stream moves at a speed of 9mph. A boat travels 39mi upstream and 39 mi downstream in a total time of 11hr. what is the total time of the boat in still water
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1 Expert Answer
Mark M. answered • 04/16/23
Tutor
5.0
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Mathematics Teacher - NCLB Highly Qualified
t = d / r
tdown = 39 / (b + 9)
tup = 39 / (b - 9)
tdown + tup = 11
[39 / (b + 9)] + [39 / (b - 9)] = 11
Can you solvel for b and answer?
Bradford T.
and then need to find t=78/b, for which the problem was asking
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04/18/23
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Peter R.
04/16/23