It took me 5 minutes to run 4 laps. How long does it take to run 22 laps?

Question

To run 4 laps, it took 5 minutes. How long does it take to run 22 laps. 

Answer 1

There are a couple of ways to do this.

 

1)  You can find the "minutes per lap" and multiply

      by 22., as Thomas E. did

 

(5 mins)/(4 laps) = 1.25 mins/lap

1.25(22) = 27.5 mins

 

2)  Set up a proportion:  5 mins is to 4 laps as x mins is to 22 laps...

     5/4 = x/22

     Cross multiply

     4x = 5(22)

     4x = 110

     x = 110/4

     x = 27.5 minutes

Answer 2

1 lap = 1.25 minutes, 22 laps = 22(1.25) = 27.5 minutes