SOLUTION: Harold Phoenix-Person drove for 3 hours on I-10, then decreased his speed by 10 miles per hour for the next 3 hours. If his total trip was 360 miles, what was his speed the first

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Question 310480: Harold Phoenix-Person drove for 3 hours on I-10, then decreased his speed by 10 miles per hour for the next 3 hours. If his total trip was 360 miles, what was his speed the first hour of his trip in miles per hour?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Harold Phoenix-Person drove for 3 hours on I-10, then decreased his speed by 10 miles per hour for the next 3 hours. If his total trip was 360 miles, what was his speed the first hour of his trip in miles per hour?
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1st leg DATA:
time = 3 hrs ; rate = x mph ; distance = 3x miles
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2nd leg DATA:
time = 3 hrs ; rate = x-10 mph ; distance = 3(x-10) miles
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Equation:
miles + miles = 360
3x + 3x-30 = 360
6x = 390
x = 65 mph (rate during the 1st 3 hrs)
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Cheers,
Stan H.
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