A bus traveled 25 kilometers in 30 minutes. What was the average speed of the bus in kilometers per hour?
A student walked 2 kilometers in 20 minutes, rested for 20 minutes, then walked 4 more kilometers in 20 minutes. What was their average speed in kilometers per hour?
A helicopter traveled 120 miles in 2 hours. What was the average speed of the helicopter?
A toy race car traveled around a 3 meter long track in 6 seconds. What was the average speed of the toy racecar?