Category: Rate

The figure shows taps A and B and an empty tank. 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 2.30p.m., what fraction of the tank was filled with water?