Answers

  • Brainly User
2016-02-11T07:07:07+08:00
Basic Formula:

       Distance = (Rate) (Time)

Find Time:
    
      Time = Distance / Rate

Time that each car will reach crime of scene:
Car A:
      Time = 35 km / 90 kph
      Time = 0.39 hour
      Time =(0.39 hour) (60 minutes/hour)
      Time = 23.4  or 23 minutes

Car B:
      Time = 28 km / 80 kph
      Time = 0.35 hour
      Time = (0.35 hour) (60 minutes/hour)
      Time = 21 minutes

ANSWER: Car A will reach the crime scene 2 minutes earlier than Car B, because Car A's travel time is 23 minutes, while Car B is 21 minutes.
    
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