Problem-Solving and Data AnalysisMediumFlow rate over a longer time
Problem-Solving and Data Analysis practice question
A tap fills a 6-litre bucket in 40 seconds. At this rate, how many litres of water flow from the tap in 2 minutes?
Answer: 18
Rate: 6/40 = 0.15 litres per second. Two minutes is 120 seconds: 0.15 × 120 = 18 litres. (Or: 120 seconds is three lots of 40, so 3 × 6 = 18.)
Common wrong answers
- If you answered 12
- 12 is 6 × 2, treating 2 minutes as two 40-second periods. It is three.
- If you answered 720
- 720 is 6 × 120, forgetting to divide by the 40 seconds.
- If you answered 0.3
- 0.3 is 0.15 × 2, using 2 seconds instead of 2 minutes.
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