18. A plane flies 600 miles in 3 hours. What is the plane's speed?
300 mph
100 mph
200 mph
19. If a ferry travels 80 kilometers in 4 hours, what is its speed?
40 km/h
20 km/h
10 km/h
20. A penguin slides 5 kilometers in 2 hours. What is the penguin's speed?
1.25 km/h
5 km/h
2.5 km/h
