) Charlie and Colby are working in a cookie factory. The cookies are baked at 425◦F, cool down in 12 minutes, and are then boxed at room temperature. Charlie is close to the left end of a 78-m long...

) Charlie and Colby are working in a cookie factory.
The cookies are baked at 425◦F, cool down in 12 minutes,
and are then boxed at room temperature.
Charlie is close to the left end of a 78-m long conveyor
belt; he takes the cookies from a hot tray and places five
cookies on the belt in 30 seconds. Colby is near the right
end and does the packing. The boxes can hold 50 cookies.
a) Describe how this system can be used as a model of a continuous wave.
b) Charlie places the tray of hot cookies on a cart. He pushes the cart towards Colby at the speed
vCh = 2 m/min. How long does it take Colby to fill a box?