**A rectangular fish tank 80 cm long and 60 cm wide is filled with water from a tap which flows at a rate of 3 litres per minute. If the tap is turned off after 40 minutes, what is the height of the water level in the container?Solution**

1 minute ----- 3 litres or 3000 ml

40 minutes ----- 40 x 3000 ml

= 120 000 ml or 120 000 cubic cm

Height of water level -----

Volume = length x base x height

120 000 cubic cm = 80 cm x 60 cm x height

120 000 cubic cm = 4800 square cm x height

Height = 120 000 cubic cm divided by 4800 square cm

Height =

**25 cm (Answer)**

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