A body goes from point X to point Y with a speed of 10 m s–1. It comes back to X with a speed of 40 m s–1. The average speed of the body during the journey is ______.
A15 m s–1
B16 m s–1
C18 m s–1
D32 m s–1
A body goes from point X to point Y with a speed of 10 m s–1. It comes back to X with a speed of 40 m s–1. The average speed of the body during the journey is ______.
A15 m s–1
B16 m s–1
C18 m s–1
D32 m s–1