Current location - Training Enrollment Network - Mathematics courses - Ring the bell for the last time.
Ring the bell for the last time.
Generally speaking, the process of knocking at the door is ignored.

In other words, the time to ring the bell is zero.

So there are pictures.

| - | - | - | - | - |-

The first "-"is a duration of two seconds. The second "-"is the interval time.

Because there was no interval between the last shots.

So there is (32-2)/5=6.

That is, the interval is 6-2=4.

So under 12, there is 1 1 times 6+2=68 seconds.