3. The figure shows taps A and B and an empty tank.
Tank:
30 cm
20 cm
55 cm
At 2 p.m., tap A was turned on. Water flowed into the tank from tap A at a rate
of 4.2 litres per minute. After 5 minutes, tap B was turned on.
At 2.15 p.m., the tank was half filled with water.
(a)
How many litres of water flowed out of tap B in 1 minute?
(b)
At 2.30 p.m., what fraction of the tank was filled with water?
