Anna and Julia each take a bicycle trip. Anna rides 20 miles in 1 1/3 hours. Julia rides 246 miles in 16 hours. Which has slower unit rate? By how much?

recall that speed or rate is distance traveled over time, or:

speed, v = d/t

thus, you compare Anna's speed and Julia's speed:
Anna: v = 20/(1 1/3)
Julia: v = 246/(16)
*note: first convert mixed number to improper fraction before dividing.

hope this helps. :)

so it would e 20/4 over 3? I don't get how I would divide that from 246/16

it's 20/(4/3),, first simplify this,,

how do you simifly that?

when dividing a number by a fraction, first get the reciprocal of the fraction,,

*to get reciprocal: you just interchange the numerator and denominator, thus:
reciprocal of 4/3 = 3/4
now the operation becomes multiplication instead of division:
20 * (3/4)

i think you know how to do this. :)
let me see your work.

which is 12? Then do I divide 12 and 246/16?

nope, it's not 12,,

remember that a whole number can be written to:
20 = 20/1
now,
20/1 * 3/4 = ?

..and we will not divide the answer by 246/16,, we will just compare them.

first, let me see your answer.

Well 20 times 3 is 60

1 times 4 is 4
60/4

you're on the right track,,

now, what is 60/4 ?

15/1