1 a. Bob roller skates with a constant speed of 12 miles per hour. How far can he travel in 30 minutes?

Distances and velocity
velocity= 12 miles/hour
time 30 minutes= 1/2 hour
then with a velocity of 12 miles/hour, Bob can travel
a distance X = Velocity • Time = 12 miles x 1/2 = 6 miles