The figure shows an empty rectangular container with a capacity of 27 ℓ. The container has a height of 15 cm. Tap Q filled the container at a rate of 2.5 ℓ per minute. Tap R drained water from the container at a rate of 1.1 ℓ per minute. Both taps were turned on for 15 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
27 ℓ = 27 x 1000 = 27000 mℓ
Base area of the container
=
Volumeheight =
2700015 = 1800 cm
2 (b)
Volume of water that filled the container per minute when both taps were turned on
= 2.5 - 1.1
= 1.4 ℓ
Volume of water that filled the container in 15 minutes when both taps were turned on
= 15 x 1.4
= 21 ℓ
Volume of water needed to fill the container
= 27 - 21
= 6 ℓ
Answer(s): (a) 1800 cm
2; (b) 6 ℓ