A 2/3 pi x ^2 is the best choice
The constant of proportionality is 5. For every time the total area "A" is multiplied by one the length is multiplied by 5.
60 min = 1 hour
1st we need to know how many times 20 goes in 60 so we will divide.
60 ÷ 20 = 3
Now we will multiply to find the trains speed in miles per hour.
3 × 25 = 75
SO, the train travels 75 miles per hour.
Hope I helped ya!!
