Answer:
C
Step-by-step explanation:
you do twelve divided by 423 to get your answer.
10/21 or 0.476 miles per hour
If you divide 2/3 by 1.4 (or 14/10), you will get miles per hour.
2/3 ÷ 14/10 = 2/3 x 10/14 = 20/42 = 10/21 = 0.476