A 8.7 hour trip is made at an average speed of 73.0 km/hr.If the first third of the trip (chronologically)was driven at 96.5 km/hr,what was the average speed for the rest of the journey?
A)61 km/hr
B)51 km/hr
C)67 km/hr
D)85 km/hr

Question

Quizplus · Accepted Answer

The total distance is 8.7 hours * 73 km/hr = 635.1 km. The first third of the trip is 8.7/3 = 2.9 hours at 96.5 km/hr, covering 279.85 km. The remaining distance is 635.1 km - 279.85 km = 355.25 km, covered in 8.7 - 2.9 = 5.8 hours. The average speed for the rest is 355.25 km / 5.8 hours = 61.25 km/hr, rounded to 61 km/hr.

A 87 Hour Trip Is Made at an Average Speed of of 73.0