If a train travels 120 km in 2 hours and then 180 km in 3 hours, what is its average speed for the entire journey?
Answer: B. 72 km/h
Total distance = 120 km + 180 km = 300 km; Total time = 2 hours + 3 hours = 5 hours; Average speed = Total distance / Total time = 300 km / 5 hours = 60 km/h.