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Two cars are traveling at speeds of 120 kilometers per hour and 90 kilometers per hour respectively. If the faster one travels for 4 hours longer than the slower one and also goes twice as far, how far did the slow one travel?

 Sep 28, 2020
 #1
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Let the distance covered by the slower car = D
Let the time taken by the slower car = T

 

90T = D......................(1)
120*[T+4] = 2D..........(2)

 

T = 8 hours - time taken by the slower car.
D = 720 km - distance travelled by the slower car.

 Sep 28, 2020
 #2
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x = slower car  time                x+4 = faster car time

 

120 (x+4) = 2 (90) x

120x + 480 = 180 x

x = 8 hours        8hours at 90 k/hr = 720 km

 Sep 28, 2020

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