Math
ratios and porportions

1 to 3 ?

1. 6 / 30 = x / 606 in to 30 min = x in to 60 min
   cross multiply
   (30)(x) = (6)(60)
    30x = 360
       x = 360/30
      x = 12 inches in 60 minutes (or 1 hr)

2. 1/15 = x / 301 in to 15 min = x in to 30 min
    cross multiply
     (15)(x) = (30)(1)
      15x = 30
         x = 30/15
         x = 2 inches in 30 min (or 1/2 hr)

3. 3/20 = x/1203 in. to 20 min = x in. to 120 min (2 hrs = 120 min.)
     cross multiply
     (20)(x) = (3)(120)
      20x = 360
         x = 360/20
         x = 18 inches in 120 minutes (or 2 hrs)