<PRE><B>Question 937207</B>
On Friday he boarded an express train that traveled at an average rate of 85 miles per hour. On Sunday he returned home on a slower train that traveled at an average rate of 51 miles per hour. The total time Oscar spent on the trains last weekend was 8 hours. How many hours did Oscar spend on the train on Friday
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Friday DATA:
rate = 85 mph ; distance = x miles ; time = d/r = x/85 hrs
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Sunday DATA:
rate = 51 mph ; distance = x miles ; time = d/r = x/51
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Equation:
time + time  = 8 hrs
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x/85 + x/51 = 8
51x + 85x = 8*85*51
136x = 8*85*51
x = 255 miles
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Friday time = x/85 = 255/85 = 3 hrs
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Cheers,
Stan H.
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