A pool measuring 35 m x 20 m x 1.8 m was completely filled with water. The water was draining out of the tank at a constant rate and became completely empty after 18 minutes.
- What fraction of the pool was filled with water at the end of 17 minutes? Express your answer in the simplest form.
- How many litres of water was drained out of the pool at the end of 9 minutes?
(a)
Fraction of the pool empty per minute =
118 Fraction of the pool empty at 17
th minute
=
118 x 17
=
1718 Fraction of the pool still filled with water
= 1 -
1718 =
1818 -
1718 =
118 (b)
Volume of the pool
= 35 x 20 x 1.8
= 1260 m
3 = 1260 ℓ
Volume of water drained per minute
= 1260 ÷ 18
= 70 ℓ/min
Volume of the pool drained after the end of 9 minutes
= 9 x 70
= 630 ℓ
Answer(s): (a)
118; (b) 630 ℓ