<PRE><B>Question 275412</B>
Please help me solve: From a point on a straight road, two cars are driven in opposite directions, one at 52 miles per hour and the other at 31 miles per hour. In how many hours will they be 249 miles apart? 
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The cars are separating at the rate of (52+31) mph
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time = distance/rate
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time = 249 miles/83 mph = 3 hrs.
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Cheers,
Stan H.</PRE>