The figure shows an empty rectangular container with a capacity of 57 ℓ. The container has a height of 19 cm. Tap G filled the container at a rate of 2.8 ℓ per minute. Tap H drained water from the container at a rate of 1.2 ℓ per minute. Both taps were turned on for 24 minutes and then turned off.
- What is the base area of the container?
- After both taps were turned off, how much more water is needed to fill the container completely? Give your answer in litres.
(a)
1 ℓ = 1000 mℓ
57 ℓ = 57 x 1000 = 57000 mℓ
Base area of the container
=
Volumeheight =
5700019 = 3000 cm
2 (b)
Volume of water that filled the container per minute when both taps were turned on
= 2.8 - 1.2
= 1.6 ℓ
Volume of water that filled the container in 24 minutes when both taps were turned on
= 24 x 1.6
= 38.4 ℓ
Volume of water needed to fill the container
= 57 - 38.4
= 18.6 ℓ
Answer(s): (a) 3000 cm
2; (b) 18.6 ℓ