Selena took 20 seconds to swim from point A to point B at a speed of 4.5 m/s. She took 18 seconds to swim back from point A to point B.

Question

Find Selena's average speed when she swam from Point B to Point A

(Help me get to the answer please ty)

Answer 1

Velocity:

v = s / t

where

v = velocity or speed ( m / sec )

s = linear distance traveled ( m)

t = time ( sec )

Selena took 20 seconds to swim from point A to point B at a speed of 4.5 m /s mean:

v = 4.5 m / sec

t = 20 sec

v = s / t

4.5 = s / 20

s = 4.5 ∙ 20 = 90 m

This mean linear distance point A to point B = 90 m

Linear distance point B to point A is also = 90 m

So for point B to point A:

v = s / t

v = 90 / 18 = 5 m / s

Answer 2

Thanks!

Answer 3

Bosnian i think you are the new Albert Einstein

Answer 4

d = V * t = 4.5m/s * 20s = 90 m.

d = V * t = 90.
V * 18 = 90,
V = 5 m/s.