1.It took Jack 4 hours to drive from his house to the beach at a speed of 45km/h. If he takes 5 hours to make the return trip home,what will his speed be?

Answer 1

4 * 45 = 180 km

180 / 5 = _____km/h

Answer 2

d = rate * time

45 * 4 = rate * 5

rate = 45 * 4 / 5 = 36 km/h