A bucket holds 6 litres of water. A paddling pool is in the shape of a cuboid with dimensions 700mm x 1800mm x 3000mm. How many buckets of water would be required to fill the pool to the brim?

700mm=0.7m
3000mm= 3m
1800=1.8m

0.7 x 1.8 x 3 = 3.78m^3

37.8m^3 = 37,800L
37,800L ÷ 6L = 630Tubs

If the pool has a leak and loses water at the rate of 20ml per second, how long would it take for the pool to empty completely?

20ml = 0.02L, so

37800L / (.02L/s) = 1,890,000 seconds = 21 days 21 hrs

To find out how long it would take for the pool to empty completely, we need to determine the total volume of the pool and then divide it by the rate at which water is being lost.

The total volume of the pool is calculated by multiplying its length, width, and height:
700mm x 1800mm x 3000mm = 3,780,000 mm^3

Converting mm^3 to liters, we divide by 1000:
3,780,000 mm^3 / 1000 = 3,780 L

Now, let's calculate how long it would take for the pool to empty completely given that it loses water at a rate of 20ml per second. We can divide the total volume by the rate of water loss to find the time in seconds:
3,780 L / 0.020 L/s = 189,000 seconds

Therefore, it would take 189,000 seconds for the pool to empty completely if it lost water at a rate of 20ml per second.