You know that there are 1,609 meters in a mile. the number of feet in a mile is 5,280. use these equalities to
answer the following problems:
a. how many centimeters equals one inch?
b. what is the speed of the snail in problem 7 in inches per minute?

Part a).

You said that    1,609 meters = 5,280 feet

We know that 1 meter = 100 centimeters, and 1 foot = 12 inches.

So  (1,609 meters) x (100 centimeters/meter)  =  (5,280 feet) x (12 inches/foot)

The second fraction on each side of the equation is equal to ' 1 ', because
the numerator is equal to the denominator, so sticking it in there doesn't
change the value of that side of the equation.  But now we can cancel some
units,and wind up with the units we need.

   (1,609 meters) x (100 centimeters/meter)  =  (5,280 feet) x (12 inches/foot)

         (1,609 x100) centimeters  =  (5,280 x 12) inches

             160,900 centimeters  =  63,360 inches

Divide each side by  63,360 :        2.54 centimeters =  1 inch


part b).

I haven't seen the snail, or anything else in problem 7,
so there's no way I can answer this part.