Sum of numbers that are on clock =
1+2+3+4+5+6+7+8+9+10+11+12 = 78

78/3 = 26

Need to draw two lines to split clock to 3 parts. The sum of numbers in each part should be 16

(Draw one straight line from between 10 and 11 to between 2 and 3, creating part one )

Part one consists of numbers 11,12,1,2

Sum of the numbers in part one =11+12+1+2=26

(Draw one straight line from between 4 and 5 to between 8 and 9, creating part two)

Part two consists of numbers 5,6,7,8

Sum of the numbers in part two
= 5+6+7+8 = 26

Sum of the numbers in part three
= 3+4+9+10 = 26