A pitching machine is programmed to pitch baseballs horizontally at a speed of 87 mph. The machine is mounted on a truck and aimed backward. As the truck drives away from a man at a speed of 65 mph, the machine shoots a ball towards him.
For each of the object pairings listed below, determine the correct relative speed.
a - The speed of the pitching machine relative to the truck
b - the speed of the pitched ball relative to the truck
c - the speed of the pitching machine relative to him
d - the speed of the pitched ball relative to him
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