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2 October, 17:03

A car leaves town, A at the speed of 90 km/h. Three hours later leaves the same city another car in pursuit of the first with a speed of 120 km / h. How much time will take to reach it?

Select the appropriate response:

A) t = 6hrs

B) t = 12 hrs

C) t = 30 min

D) None of the answers are correct

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Answers (1)
  1. 2 October, 19:58
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    D) None of the answers are correct

    Step-by-step explanation:

    Let t be the time since the first car leaves

    Distance of first car:

    90t

    Distance of second car:

    120 (t - 3)

    90t = 120 (t - 3)

    90t = 120t - 360

    360 = 30t

    t = 12

    The second car takes 12-3 = 9 hours to reach it
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