0,9:18

I’m not sure what you mean by "0,9:18" (comma as decimal or time notation). Here are two common interpretations:

• If it’s a ratio (0.9:18):

  • Multiply by 10 to clear the decimal: 9:180
  • Divide by GCD 9: 1:20
  • Simplified ratio: 1:20

• If it’s a time notation (0:09:18, i.e., 0 hours, 9 minutes, 18 seconds):

  • Total duration = 9 minutes 18 seconds = 9×60 + 18 = 558 seconds

If you intended something else, please share the exact problem statement and I’ll help you solve it.