Water flows into a container through Tap H and flows out of the container through Tap J. The capacity of a container is 70 litres. When only Tap H is turned on, the container is completely filled in 16 minutes. When only Tap J is turned on, it takes
13 hour for all the water to flow out. If both taps are turned on at the same time,
- How long does it take to fill 86% of the container?
- How much water has flowed out through Tap J by the time the container is 35 filled with water? Express your answer in litres.
(a)
Tap H :
16 min → 1 container
1 min →
116 container
13 hour =
13 x 60 = 20 min
Tap J:
20 min → 1 container
1 min →
120 container
Tap H and Tap J:
1 min →
116 -
120 =
580 -
480 =
180 container
1 container →
801 = 80 min
86% container → 86% x 80 = 68.8 min
(b)
Time taken to fill
35 of the container
1 container → 80 min
35 container → 80 x
35 = 48 min
Volume that flows out per min
=
120 container
=
120 x 70
= 3.5 ℓ
Volume of water that flowed out through Tap J in 48 min
= 48 x 3.5
= 168 ℓ
Answer(s): (a) 68.8 min; (b) 168 ℓ