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David started across a lake 15 miles wide in his fishing boat at 10 miles per hour. He had to row the rest of the way at only 5 miles per hour after his motor went out. If he was rowing for half the time that the trip took, how long did the total trip take

 Feb 8, 2020
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Let the distance he rowed = D
The distance he covered by boat =15 - D
(15 -D) / 10 =D / 5, solve for D
D = 5 miles he rowed
5/5 = 1 hour - he spent rowing
[15 - 5] / 10 =1 hour - he spent driving the boat.
Total time = 1 + 1 =2 hours - half of which he spent rowing.

 Feb 8, 2020

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