SOLUTION: Dan left school and drove east on Mass Pike at 55 mph. One hour later, Joe left school and traveled west on the Mass Pike at 50 miles per hour. How long will Dan have traveled when
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Question 1049381: Dan left school and drove east on Mass Pike at 55 mph. One hour later, Joe left school and traveled west on the Mass Pike at 50 miles per hour. How long will Dan have traveled when he and Joe are 300 miles apart? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! What is Dan's head start in miles? mi
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Start a stopwatch when Joe leaves. Let = time in hrs on stopwatch when
they are mi apart
Let = distance Joe travels until
they are mi apart
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Joe's equation:
(1)
Dan's equation:
(2)
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Substitute (1) into (2)
(2)
(2)
(2) hr
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Dan will have traveled for 1 hr ( his head start ) plus
2 hrs and 20 min for a total of
3 hrs and 20 min
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check:
Joe travels a distance of:
(1)
(1)
and, in time hrs,
Dan traveled:
(2)
(2)
(2) mi
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Now add the headstart of mi
close enough to mi
OK
