If a vehicle travels 240 km in 3 hours and then 180 km in 2 hours, what is the average speed for the entire journey?
Answer: B. 70 km/h
Total distance = 240 km + 180 km = 420 km; Total time = 3 hours + 2 hours = 5 hours. Average speed = Total distance / Total time = 420 km / 5 hours = 84 km/h.