Josiah rides his bike 18 miles in 2 hours. If he rides at a constant speed, select the answers below that are equivalentratios to the speed he rides. Select all ratios that are equivalent.

We have to check if the result of each proportion is the same as 9 miles per hour, which is the ratio given after simplifying
A. 27 miles in 4 hours is equal to 6.75 miles per hour, therefore is not correct
B. 54 miles in 6 hours is equal to 9 miles per hour, therefore is correct
C. 36 miles in 5 hours is equal to 7.2 miles per hour, therefore is not correct
D. 9 miles in 1 hour is equal to the given ratio, then this answer is correct.
The correct answers are B and D.