A car travels 0.90 km at an average speed of 84.8 km/h and then 0.97 km at an average speed of 41.6 km/h. What is the car's average speed during the 1.87 km interval?

Answer 1

average speed = (distance travelled)/time

= (0.90 + 0.97)/[.90/84.8 + 0.97/41.6]
= 1.87 /(0.010613 + 0.023317)
= 1.87 / 0.03393
= 55.1 miles/hr

Answer 2

answer is same but concept could be more clear