The number of people who won the third prize accounted for 5/8 of the total number of winners.
So, 50 people won the third prize.
So, 30 people won the first prize and the second prize.
Also, the number of people who won the first prize in 1.2 is 1: 4.
That is, the number of people who won the second prize accounted for 4/5.
Therefore, the number of people who won the second prize is:
4/5×30=24
Therefore, there are 24 second prize winners.