Final volume = 36π ≈ 113.097 cubic meters
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- Volume of the tank = π × r² × h = π × 3² × 5 = 45π cubic meters
- Water drained = 20% of 45π = 0.2 × 45π = 9π cubic meters
- Remaining water = 45π – 9π = 36π cubic meters
- #### 113.097
- A car travels 120 km at an average speed of 60 km/h, then travels another 180 km at 90 km/h. What is the weighted average speed for the entire journey in km/h?
- Time for first part = 120 / 60 = 2 hours
