Practice Quiz

National Police Officer Exam Prep

Category - Police Officer

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The police officer drove east at an average speed of 90 kilometers (km) per hour for 3 minutes. During the remaining 100 minutes of her travel, the investigator drove north. If the investigator drove a total of 204.5 km, what was her average speed when traveling north?

  1. 95 km/hr
  2. 100 km/hr
  3. 120 km/hr
  4. 130 km/hr
  5. None of these
Explanation
Answer: C - 3 mins = 1/20 hr (60 ÷3); 1/20 x 90 km/hr = 4.5 km traveled in the first 3 minutes; 204.5 km - 4.5 km = 200 km remaining. 100 mins = 1 hour and 40 minutes which equals 1 2/3 hrs or 5/3 hrs; speed (rate) for the remaining 200 km = 200 km ÷ 5/3 hrs = 120 km/hr
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