SOLUTION: Jane rides her bike to Lake Moultrie. Going to the lake she averages 12mph. On the return trip, she averages 10 mph. If the round trip takes a total of 5.5 hours, how long does the

Question 1017606: Jane rides her bike to Lake Moultrie. Going to the lake she averages 12mph. On the return trip, she averages 10 mph. If the round trip takes a total of 5.5 hours, how long does the return trip take?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Jane rides her bike to Lake Moultrie. Going to the lake she averages 12mph. On the return trip, she averages 10 mph. If the round trip takes a total of 5.5 hours, how long does the return trip take?
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Avg speed of the round trip = 2*12*10/(10+12) = 120/11 mi/hr
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d = r*t = (120/11)*5.5 = 60 miles RT, 30 miles each way.
t = d/r = 30/10 = 3 hours returning

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