Question

Rebecca travels 160 km in 2.5hours and then travels at a constant speed of 85 km/h for a further 2 hours. Find the average speed, in km/h to 3 significant figures, for the whole journey.

Answer 1

73.3 km/h

Explanation:

Average rate of speed = total distance/total time

First distance is 160

Second distance = rt = 85(2) = 170

total distance = 160 + 170 = 330

total time = 2.5 + 2 = 4.5

Average speed = 330/4.5 = 73.3 km/h