SOLUTION: Rajee drove from Newark, NJ, to New Brunswick during rush hour at an average speed of 30 miles per hour, and then drove back the same way at an average speed of 60 miles per hour.

Question 1145371: Rajee drove from Newark, NJ, to New Brunswick during rush hour at an average speed of 30 miles per hour, and then drove back the same way at an average speed of 60 miles per hour. If the round trip took 1 hour and 15 minutes, how many miles is Rajee's one-way trip from New Brunswick to Newark, NJ?
Answer by ikleyn(52803) (Show Source): You can put this solution on YOUR website!
.

Let "d" be one way distance under the question.


Then    is the driving time in one direction, in hours, while

        is the driving time in other direction.


The total "time" equation is  


     +  =    hours.


To solve it, multiply both sides by 60.  You will get


    2d   +  d = 75

    3d        = 75

     d        = 25 miles.      ANSWER


CHECK.    +  =  +  =  =  hours.   ! Correct !

Solved.

-------------

Using "time" equation is the STANDARD method of solving such problems.

It is simple, logical, straightforward, economic and robust (works in standard way for any input data).

Going in this way, you will never make a mistake - the logic of the method
prevents you of making mistakes.

From this lesson, learn on how to write, how to use and how to solve a "time" equation.

To see many other similar solved problems, look into the lessons
    - Had a car move faster it would arrive sooner
    - How far do you live from school?
    - Earthquake waves
    - Time equation: HOW TO use, HOW TO write and HOW TO solve it
in this site.

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