3. Jackson drove a car from Amherst to Boston at the
constant speed of 60 miles per hour. On the way back
along the same route, he drives at a constant speed of
40 miles per hour. If he took 6 hours for the entire
trip, what is the distance, in miles, from Amherst to
Boston?
A) 120
B) 144
C) 160
D) 240
