P6 / Henry Park / 2019 / SA1 / Paper 2 – Q14 [4 marks]

Question:

A rectangular tank, with a capacity of 60 litres, was partly filled with water at first. Tap A was turned on to add more water into the tank. After 10 minutes, Tap A was turned off and Tap B was turned on to drain water out of the tank until the 30th minute. The line graph shows the volume of water in the tank over the period of 30 minutes.
(a) How many litres of water flowed into the tank in 1 min when Tap A was turned on?
(b) Each statement below is either true, false or not possible to tell from the information given. For each statement, put a tick (✓) in the correct column.