一家公司使用两台印刷速率不同的机器 A 和 B 来印刷贴纸。下面的图表显示了每台机器从下午 1 点开始印刷的贴纸总数。

1. Evaluate Statement 1: Machine B printed 40 more stickers than machine A in the first hour.

From the graphs, at 2 p.m. (after 1 hour):
Machine A printed $160$ stickers.
Machine B printed $200$ stickers.
Difference $= 200 - 160 = 40$.
Statement 1 is True.

2. Evaluate Statement 2: Machine A took 30 minutes less than machine B to print 400 stickers.

From the graphs, to print 400 stickers:
Machine B took until 3 p.m., which is $2$ hours.
Machine A prints at $160$ per hour. Time taken $= \frac{400}{160} = 2.5$ hours ($2$ hours $30$ minutes).
Machine A took $30$ minutes more than Machine B, not less.
Statement 2 is False.

3. Evaluate Statement 3: Machines A and B printed a total of 640 stickers in $\frac{1}{2}$ hours.

In $\frac{1}{2}$ hour (30 minutes):
Machine A prints $\frac{160}{2} = 80$ stickers.
Machine B prints $\frac{200}{2} = 100$ stickers.
Total $= 80 + 100 = 180$ stickers.
$180 \neq 640$.
Statement 3 is False.

1. Determine the time taken for machine B to print 800 stickers

From Graph 2, machine B prints $800$ stickers at $5\text{ p.m.}$
Time taken from $1\text{ p.m.}$ to $5\text{ p.m.}$ is $4$ hours.

2. Calculate the number of stickers machine A prints in the same time

From Graph 1, machine A prints $160$ stickers per hour.
In $4$ hours, machine A prints $160 \times 4 = 640$ stickers.