Based on the rates in the table, how many more items can Machine B produce in one hour than Machine A?

First, calculate the production rate per minute for each machine.

Machine A: 60 items / 12 minutes = 5 items per minute.

Machine B: 90 items / 10 minutes = 9 items per minute.

Next, convert these rates to items per hour. Since there are 60 minutes in an hour:

Machine A: 5 items/minute · 60 minutes/hour = 300 items per hour.

Machine B: 9 items/minute · 60 minutes/hour = 540 items per hour.

Finally, find the difference between the hourly production rates:

540 items per hour (Machine B) - 300 items per hour (Machine A) = 240 items per hour.

Therefore, Machine B can produce 240 more items in one hour than Machine A.

A is incorrect because it is the difference in the number of items produced per minute (9 - 5 = 4), not per hour.

B is incorrect because it is the difference in the number of items listed in the table (90 - 60 = 30), which ignores the different time intervals.

D is incorrect because it is the sum of the hourly production rates (540 + 300 = 840), not the difference.