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Joaquin drove from Newark, NJ, to New Brunswick during rush hour at an average speed of 30miles per hour, and then drove back the same way at an average speed of 60miles per hour. If the round trip took 1 hour and 15 minutes, how many miles is Joaquin's one-way trip from New Brunswick to Newark, NJ,?

 Feb 7, 2020
 #1
avatar+21931 
+2

You have 2 rates     and the time involved to complete 1 round trip

 

rate x time = distance

 

distance / rate = time

 

d/60  +  d/30   = 1.25      ( 1.25 hour = 1 hour 15 min)

d/60  + 2d/60  = 1.25

3d/60   = 1.25

3d = 75

d = 25 miles

 Feb 7, 2020
 #2
avatar+78 
+1

Ahh dang it EP! You beat me to the answer! Anyways, I totally agree that you should remember the d=rt formula for problems like these. It makes it a lot easier when computing if you know how to switch out variables for the specific one you are looking for.

 Feb 7, 2020

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