Answer:
First belt: 7.5 ft/sec
Second belt: 2.5 ft/sec
Step-by-step explanation:
Let s represent the speed of the 1st belt.
Distance of the 1st belt = 300ft
So time = distance / speed = 300 / s .............Equation 1
Speed of the 2nd belt = (s - 5)
Distance of the 2nd belt = 100 ft
So time = distance / speed = 100 / (s - 5) .........................Equation 2
Since an apple spends the same time on each belt, we can equate both equations for time and solve for s;

Since the speed of the first belt is 7.5ft/sec, we can go ahead and solve for the speed of the 2nd given that it 5ft/sec slower than the 1st;
