SOLUTION: A car travels at an average speed of 60 km/h from town A to town B .if the car travels at an average speed of 72 km/h instead ,it would reach Town B 15 minutes earlier .calculate t

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Question 1175717: A car travels at an average speed of 60 km/h from town A to town B .if the car travels at an average speed of 72 km/h instead ,it would reach Town B 15 minutes earlier .calculate the distance between town A and town B
Answer by ikleyn(52776)   (Show Source): You can put this solution on YOUR website!
.

Let d be the distance between the cities.


Write the "time" equation


     -  =    of an hour   (which is 15 minutes)


To solve it, multiply both sides by 360 (LCM of numbers 60, 72 and 4).  You will get


    6d - 5d = 90

       d    = 90.


ANSWER.  The distance is 90 kilometers.


CHECK.    =  =  =  of an hour.   ! Correct !

Solved.



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