Explanation: It says that they can fill 5 boxes in 35 minutes so first you have to figure out how much time 1 box takes to get filled.
How to solve: To find out how much time it takes to fill up one box you have to divide 35 by 5 which is 7. In conclusion it would take 7 minutes for each box filled. So each row would increase by a double.
Answer: A
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