Answer:
5 hours
Step-by-step explanation:
We can write a ratio
20 laps 100 laps
-------------- = --------------
1 hour x hours
Using cross products
20x = 100
Divide by 20
20x/20 = 100/20
x = 5 hours
Answer:
5 hours
Step-by-step explanation:
It takes Marcie 1 hour to swim 20 laps so to swim 100 laps divide by 20. 100/20=5
