posted by Victoria .
A car travels 90.0 minutes on the highway. For the first 36.6 minutes it travels 76.5 km/h. It maintains 95.1 km/h for the remainder of the trip. What was the average speed of the vehicle in km/h?
t=90 min = 1.5 h
t1= 36.6 min =0.61 h
t2=1.5-0.61= 0.89 h.
Ave speed = s/t = 131.304/1.5 =87.536 km/h