Question 642593
Wilma drove at an average speed of 50 mi/h from her home in Boston to visit her sister in Buffalo. She stayed in Buffalo 10 hours and, on the trip back, averaged 45 mi/h. She returned home 29 hours after leaving. How many miles is Buffalo from Boston?
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Avg speed for the round trip is 2*50*45/(50+45) = 900/19 mi/hr
She drove 19 hours
d = r*t = (900/19)*19 = 900 miles RT
= 450 miles each way