To ride to school, Elaine takes 7 minutes to ride 18 blocks. What is her unit rate (blocks per minute)? Assuming she rides at a constant speed, how long should it take her to go 50 blocks?
She rides 18/7 blocks in one minute
To see how long it would take her to ride 50 blocks, we have
50 / (18/7) =
50 * 7 / 18 = about 19.444 minutes
+11 
