A pool measuring 30 m x 28 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 28 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 7 minutes?
(a)
Fraction of the pool empty per minute =
128 Fraction of the pool empty at 17
th minute
=
128 x 17
=
1728 Fraction of the pool still filled with water
= 1 -
1728 =
2828 -
1728 =
1128 (b)
Volume of the pool
= 30 x 28 x 1.8
= 1512 m
3 = 1512 ℓ
Volume of water drained per minute
= 1512 ÷ 28
= 54 ℓ/min
Volume of the pool drained after the end of 7 minutes
= 7 x 54
= 378 ℓ
Answer(s): (a)
1128; (b) 378 ℓ