A water tank is being drained for maintenance. The table and graph show the volume v v\,v of water remaining in the tank at time t t\,t hours.
| Time ttt (hours) | Volume vvv (litres) |
|---|---|
| 0 | 15,000 |
| 4 | 12,600 |
| 8 | 10,200 |
| 12 | 7,800 |
| 16 | 5,400 |
| 20 | 3,000 |
Work out the rate at which the water is being drained from the tank.
Give your answer in litres per hour.
Practise Oxford AQA IGCSE Maths Real Life and Distance Time Graphs with exam-style questions for Core and Extended tier. 21 questions, matched to the Oxford AQA IGCSE Maths (9260) specification and written in Paper 1 and Paper 2 (Core: 1C and 2C; Extension: 1E and 2E) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.