The figure shows an empty rectangular container with a capacity of 60 ℓ. The container has a height of 25 cm. Tap C filled the container at a rate of 3.6 ℓ per minute. Tap D drained water from the container at a rate of 1.9 ℓ per minute. Both taps were turned on for 20 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
60 ℓ = 60 x 1000 = 60000 mℓ
Base area of the container
=
Volumeheight =
6000025 = 2400 cm
2 (b)
Volume of water that filled the container per minute when both taps were turned on
= 3.6 - 1.9
= 1.7 ℓ
Volume of water that filled the container in 20 minutes when both taps were turned on
= 20 x 1.7
= 34 ℓ
Volume of water needed to fill the container
= 60 - 34
= 26 ℓ
Answer(s): (a) 2400 cm
2; (b) 26 ℓ