<PRE><B>Question 996979</B>
Linda and Dave leave simultaneously from the same point biking in opposite directions. Linda bikes at 6 mph and Dave bikes at 10 mph. How long will it be until they are 20 miles apart from each other? 
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Their combined separating speed is 6+10 = 16 mph
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Ans: time = 20/(16) = 5/4 hr = 1 hr 15 minutes
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Cheers,
Stan H.
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