1 litre = 1,000 cm³ Here is a diagram of a swimming pool and a sign from the pool. The pool depth increases at a constant rate and is then a constant depth.

Work out the length marked x.

Swimming Pool Information

Depth in shallow end 1.1 m
Depth in deep end 1.9 m
Length of pool 25 m
Width of pool 10 m
Pool capacity 409,000 litres​