kinda stuck on this physics problem?

orange_crush_05

New member
the problem is at the acme w&w company, supplies come in and are unloaded using a conveyor belt. if the belt is 10 m long and a box of supplies takes 3 seconds to travel the length of the belt, what is the averae speed of the boxes on the belt.
for sum reason i want to subtract and say 7 seconds?
 
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