A rectangular tank 40 cm long, 30 cm wide and 32 cm high was
56 filled with water.
- What was the volume of the water in the tank in litres?
- A tap was used to drain the water from the tank at a rate of 4 ℓ per minute. The tap was turned off when the tank was 14 filled with water. How long did it take to drain the water?
(a)
Volume of water in the tank
=
56 x 40 x 30 x 32
= 32000 cm
3 1000 mℓ = 1 ℓ
32000 mℓ = 32000 ÷ 1000 = 32 ℓ
Volume of water in the tank = 32 ℓ
(b)
Volume of water in the tank in the end
=
14 x 40 x 30 x 32
= 9600 cm
3 Volume of water that was drained from the tank
= 32000 - 9600
= 22400 cm
34 ℓ = 4 x 1000 = 4000 mℓ
Time taken for the tap to drain the water
= 22400 ÷ 4000
= 5.6 min
Answer(s): (a) 32 ℓ; (b) 5.6 min