Answer:
3 : 7 : 5
Step-by-step explanation:
Given
12 : 28 : 20 ← divide each part by 4 ( the LCM of 12, 28, 20 )
= 3 : 7 : 5
Unless there's more to that question, it would be $45.00
45mph
225mi / 5hr = 45mph
1.78