A train moves along a straight line. Its location at time t is given by s(t) = 50 t , 3 ≤ t ≤ 8, where t is measured in hours and s(t) is measured in kilometers

Question

Find the average velocity of the train between t = 3 and t = 8.

Answer 1

Average velocity = [change in distance] / [change in time] = [s(8) - s(3)] / [8 - 3] = 250 km / 5 hr = 50 km/hr