An amusement park line is moving about 4 feet every 15 minutes at this rate approximately how long will it take for a person at the back of the 50 Foot line to reach the front of the line?

4/15 = 50/x ... 4 ft to 15 min = 50 ft to x minutes

this is a proportion, so we cross multiply

(4) (x) = (15) (50)

4x = 750

x = 750/4

x = 187.5 minutes or 3 hrs and 7.5 minutes

or u can do it this way ...

15/4 = 3.75 ft per minute ... 50 * 3.75 = 187.5 minutes