A person, travelling on a motorway a total distance of 200 km,travels the first 90 km at an average speed of 80 km/hr. Which average speed must be obtained for the rest of the journey if the person is to reach the destination in a total time of 2 hours 0 minutes?
Correct answer: D. 126 km/hr
- A. 110 km/hr
- B. 120 km/hr
- C. 122 km/hr
- D. 126 km/hr
Explanation
Average speed = total distance / total timeTime taken to travel first 90 km = 90/80=1.125 h = 1h 7.5 minFor the rest of the journey, Distance that needs to be travelled =200-90 = 110 km Time remaining =2h-1.125 h- 0.875 hAverage speed = total distance/ total time = 110 / 0.875 = 126 km/hAs it is numerical, it can have only one answer.
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