A vehicle travels 150 km in 3 hours and then 100 km in 2 hours. What is the average speed for the entire journey?
Answer: B. 40 km/h
Total distance = 150 km + 100 km = 250 km; Total time = 3 hours + 2 hours = 5 hours; Average speed = Total distance / Total time = 250 km / 5 hours = 50 km/h.