April swims 50 m north and then turns and swims 20 m back to the south.

What is her velocity if it takes her 60 seconds?

0.5 m/s north

Explanation:

Velocity is displacement over time.

v = Δx / Δt

Displacement is the difference between the final position and the initial position. April swims 50 m north, then turns and swims 20 m south. So her displacement is 30 m north.

v = (30 m north) / (60 s)

v = 0.5 m/s north