If you have swam one lap in a swimming pool, that means you have swam from one end to the other and back. In 3.5 h, a swimmer makes exactly 86 laps in a swimming pool that is 43 m long. Determine the distance the swimmer traveled, the total displacement of the swimmer, the swimmer's average velocity, and the swimmer's average speed.

Answer 1

First, an English lesson.
http://www.verb2verbe.com/conjugation/english-verb/swim.aspx

So if you have swum one 43 laps, you end at the place you started. your displacement is zero.
average velocity: zero
distance: 86*43*2

average speed: distance/time

Answer 2

If you have swam one lap in a swimming pool, that means you have swam from one end to the other and back. In 3 h, a swimmer makes exactly 30 laps in a swimming pool that is 30 m long. Determine the distance the swimmer traveled, the total displacement of the swimmer, the swimmer's average velocity, and the swimmer's average speed.