Answer:
I agree with 3 days
Explanation:
1) Ratio for laps to meters to days
1 lap: 400 meters -> 10 laps: 400 meters = 1 day
OK, 1 kilometer is 1,000 meters. Keep that in mind.
*12 kilometers is the equivalent to 12000 meters*
2) Ratio problem and cross multiply
10:400 = 1 day so x laps :12000 meters
HOW MANY TIMES DOES 400 GO INTO 12000? 30 times
30 is the amount of laps ran.
If you multiply 10:400 by 3 it will equal 30:12000.
3 is your answer