Norman started across a lake 10 miles wide in his fishing boat at 12 miles per hour. After his motor went out, he had to row the rest of the way at only 3 miles per hour. If he was rowing for half the time that the total trip took, how long was the trip?

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Answer 1 · 2018-02-01T23:25:46

1 hour 20 minutes

Let t = the total time of the trip:

#12*t/2+3*t/2=10#
#6t+(3t)/2=10#
#12t+3t=20#
#15t=20#
#t=20/15=4/3 hr = 1 1/3 hr#
t = 1 hour 20 minutes