To convert 60 inches per second to feet per minutes, you would need to convert both the inches to feet and the seconds to a minute. You could start with either one.
I will start with 60 inches. 60 inches = 5 feet (60/12)
The conveyor belt moves the object 5 feet per second.
The next step would be to convert the second to 60 seconds (1 minute)
If the object travels 5 feet per second, than it will travel 60 groups of 5 feet in 60 seconds. 60 x 5 = 300 feet
The object will move 300 feet in 1 minute.