30:10

Do you mean one of these? “30:10” can have a few interpretations.

• Ratio: 30:10 -> simplify by gcd 10 → 3:1.
• Time (minutes:seconds): 30:10 means 30 minutes 10 seconds → total seconds = 30×60 + 10 = 1810; in minutes ≈ 30.1667; in hours ≈ 0.503.
• Division: 30 ÷ 10 = 3.

Which interpretation matches your problem? If you share the context or the exact question, I can give a step-by-step solution.