A pool measuring 30 m x 28 m x 3 m was completely filled with water. The water was draining out of the tank at a constant rate and became completely empty after 20 minutes.
- What fraction of the pool was filled with water at the end of 19 minutes? Express your answer in the simplest form.
- How many litres of water was drained out of the pool at the end of 10 minutes?
(a)
Fraction of the pool empty per minute =
120 Fraction of the pool empty at 19
th minute
=
120 x 19
=
1920 Fraction of the pool still filled with water
= 1 -
1920 =
2020 -
1920 =
120 (b)
Volume of the pool
= 30 x 28 x 3
= 2520 m
3 = 2520 ℓ
Volume of water drained per minute
= 2520 ÷ 20
= 126 ℓ/min
Volume of the pool drained after the end of 10 minutes
= 10 x 126
= 1260 ℓ
Answer(s): (a)
120; (b) 1260 ℓ