SOLUTION: When the speed of a car is increased by 36 kph, it passes thrice as many light posts as it was at ordinaryspeed. Find the ordinary speed of the car.

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Question 1176277: When the speed of a car is increased by 36 kph, it passes thrice as many light posts as it was at ordinaryspeed. Find the ordinary speed of the car.
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
.

If x is the ordinary (normal) speed, in kph.


Then from the condition


    x + 36 = 3x,


which implies


    36     = 3x - x

    36     = 2x

     x     = 36/2 = 18 kph.     ANSWER

Solved.