The interval between each salute is 3.5 seconds, that is, the time from the launch of one shell to the start of the next launch. And the 28-gun salute rang 100, so we should know how many times the 28-gun salute will ring. Since 100 is the number of salutations to * * * * from 28, we can divide 100 by 28 to calculate the average number of utterances of a * * *. That is, 100 ÷ 28 ≈ 3.5438+04 cycles/time.

But in fact, the time interval between rings is equal to the number of sounds in each ring multiplied by the time interval of each ring. That is 4 times ×3.5 seconds/sound = 14 seconds/time. Because each * * * ring sounds four times, 100 can be divided by four to calculate how many times a * * * ring needs to be performed. That is 100÷4=25 times. Then you can multiply the time interval of each * * * sound by the number of * * * sounds required for the total * * * sound to calculate the time required for the total * * * sound. That is, 14 second/time× 25 times =350 seconds.