SOLUTION: from a point on a straight river, one boat is driven upstream at 9 miles per hour, and another boat is driven downstream at 8 miles per hour. In how many hours will they be 34 mile
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Question 931717: from a point on a straight river, one boat is driven upstream at 9 miles per hour, and another boat is driven downstream at 8 miles per hour. In how many hours will they be 34 miles apart? Answer by TimothyLamb(4379) (Show Source):
You can put this solution on YOUR website! x = speed of current
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relative speed of the two boats:
(9 - x) + (8 + x)
9 + 8 - x + x
9 + 8 = 17 mph
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s = d/t
t = d/s
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t = 34/17
t = 2
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answer:
in 2 hours they'll be 34 miles apart
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