The figure shows an empty rectangular container with a capacity of 60 ℓ. The container has a height of 30 cm. Tap J filled the container at a rate of 2.7 ℓ per minute. Tap K drained water from the container at a rate of 1.4 ℓ per minute. Both taps were turned on for 25 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 =
6000030 = 2000 cm
2 (b)
Volume of water that filled the container per minute when both taps were turned on
= 2.7 - 1.4
= 1.3 ℓ
Volume of water that filled the container in 25 minutes when both taps were turned on
= 25 x 1.3
= 32.5 ℓ
Volume of water needed to fill the container
= 60 - 32.5
= 27.5 ℓ
Answer(s): (a) 2000 cm
2; (b) 27.5 ℓ