Question

10. Ahmad drives 60 km from his house to the petrol station in a car moving at a constant speed of
60 km/h. Then he moves the same distance to a shop at a constant speed of 120 km/h. The
average speed for the entire trip from his house to the shop is

Answer 1

Answer:

Explanation:

Average speed is distance traveled over time taken to do so

home to station

d = 60 km

t = 60 km/60 km/hr = 1 hr

station to shop

d = 60 km

t = 60 km / 120 km/hr = ½ hr

speed

s = (60 + 60) / (1 + ½) = 120/1.5 = 80 km/h