约翰制作1架玩具飞机需要25分钟。下午2:05，他完成了4架玩具飞机的制作。假设他中途没有进行任何休息，他是在什么时间开始制作玩具飞机的？

1. Calculate the total time taken to make 4 toy airplanes.

Total time $= 4 \times 25 \text{ minutes} = 100 \text{ minutes}$

2. Convert the total time into hours and minutes.

$100 \text{ minutes} = 1 \text{ hour } 40 \text{ minutes}$

3. Work backwards from the finish time to find the start time.

Finish time is 2.05 p.m.
Subtract 1 hour: 1.05 p.m.
Subtract 40 minutes from 1.05 p.m.:
$1.05 \text{ p.m.} - 5 \text{ minutes} = 1.00 \text{ p.m.}$
$1.00 \text{ p.m.} - 35 \text{ minutes} = 12.25 \text{ p.m.}$