17. A museum has a special clock with 20 divisions in a circle. The needle jumps once every 7 minutes, and each jump covers 9 divisions. This morning at 8 o'clock, the needle jumped from 0 to 9. What division was the needle pointing to at 8 o'clock last night?
【Answer】Solution: Since the pointer jumps once every 7 minutes, and each jump covers 9 spaces, that is, it jumps 9 spaces every 7 minutes,

and there are 20 spaces in a full circle,
so after $7 \times 20=140$ minutes, it will have jumped exactly 9 circles and return to its original position.
From 8 PM last night to 8 AM this morning, there are $12 \times 60=720$ minutes, $720=140 \times 5+7 \times 2+6$,
At 8:20 PM last night, it jumped from 0 to 9,
At 8:13 PM, it jumped from 11 to 0, at 8:06 PM, it jumped from 2 to 11,
At 8 PM last night, the pointer had not jumped yet, pointing at 2.
Answer: At 8 PM last night, the pointer was pointing at 2.