Derek swam 5 laps in 1/4
of an hour. Find the laps he swims per hour.

Answer

Derek swims 20 laps per hour.

Explanation

If Derek swims 5 laps in 1/4 of an hour, he swims 4 times of 5 laps in an hour. This is because 4 times 1/4 is one, or an hour. 5 times 4 is 20.

Step-by-step explanation:

1. (1/2×1×2)+(2×2)

2. (1×1)+(2×3)

3. (4×2)+(1×4)

4. 2(1/2×3×2)

5. (4×4)+(2×4)

6. (2×6)+(1×5)

7. (190×320)+(1/2×320×305)