- Normally, the container fills in 5 hours, meaning it fills at a rate of 1/5 of the container per hour.
- With a leak, it takes 6 hours to fill, indicating a net filling rate of 1/6 of the container per hour.
- The rate of leakage is the difference between the normal filling rate and the net filling rate: 1/5 - 1/6.
- Calculate the rate of the leak: (1/5 - 1/6 = 1/30) of the container per hour.
- Therefore, when full, the leak would empty the container in 30 hours.

**Option:4 - 30 h** ✅

YOUR ANSWER IS RIGHT