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Mary averages 12 mph riding her bike to school.  Averaging 36 mph by car takes her one-half hour less time.  What is the distance to Mary's school?

 Jun 10, 2020
 #1
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Mary averages 12 mph riding her bike to school.  Averaging 36 mph by car takes her one-half hour less time.  What is the distance to Mary's school?

laugh

 Jun 10, 2020
edited by Omi67  Jun 10, 2020
edited by Omi67  Jun 10, 2020
 #2
avatar+26605 
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The distance is the same

 

rate * time = distance       (using x as the time on the bike)

12 * x   = 36 * (x-1/2)

18 = 24x

x = 3/4    hr            On the bike  for 3/4 hr    =        3/4 hr * 12 m/hr = 9 miles    (one way)           

 Jun 10, 2020

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