June+rode+her+bike+18+miles+in+90+m inutes.+chris+rode+his+scooter+12+m iles+in+72+minutes.+who+traveled+at +a+greater+average+speed? +define+an+appropriate+unit+of+spee d

Step-by-step explanation:

June: 18 miles in 90 minutes. Now you want to use the unit m/h; so we're going to find how many miles are rode in 1 hour. 1 hour is 60 minutes and 90 divided by 60 is 1.5. So you are also going to divide 18 by 1.5 which equals 12 m/h.

Chris: do the same equation for Chris; 72÷60= 1.2 and then 12÷1.2= 10 m/h.

relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

it alot will look like this 4.4