A new unit of volume called an "olympic swimming pool" is introduced. This is defined as 50 m x 20 m x 2 m. How many litres is this?

To convert the volume of the "Olympic swimming pool" from cubic meters to liters, you need to know that 1 cubic meter is equivalent to 1,000 liters.

First, calculate the volume of the pool in cubic meters. The volume (V) of a rectangular prism (like our pool) is calculated by multiplying its length (L), width (W), and height (H). So, V = L x W x H.

In this case, the pool is 50 m long, 20 m wide, and 2 m deep. So, the volume in cubic meters is:

V = 50 m x 20 m x 2 m = 2,000 cubic meters.

Then, convert this volume to liters by multiplying by 1,000 (since 1 cubic meter = 1,000 liters):

2,000 cubic meters x 1,000 = 2,000,000 liters.

So, an "Olympic swimming pool" as defined would contain 2,000,000 liters of water.