Answer:
A
Step-by-step explanation:
The sum of the 3 angles in a triangle = 180°
Subtract the sum of the 2 given angles from 180 for third angle
third angle = 180° - (39 + 56)° = 180° - 95° = 85° → A
172 ÷ 4 = 43 miles per hour
43 ÷ 5 = 10.75 miles per 12 minutes
