Problem-Solving and Data AnalysisMediumConverting a rate across time units
Problem-Solving and Data Analysis practice question
Water flows from a pipe at a constant rate of 2.5 litres per second. How many litres flow from the pipe in 1 hour?
Answer: 9000
One hour is 60 × 60 = 3,600 seconds. At 2.5 litres each second: 2.5 × 3,600 = 9,000 litres.
Common wrong answers
- If you answered 9
- 9 is 9,000 with a slip of three places; 2.5 × 3,600 = 9,000.
- If you answered 150
- 150 is 2.5 × 60 — the amount in one MINUTE. An hour has 60 minutes, so multiply by 60 again.
- If you answered 1440
- 1,440 is 24 × 60, the number of minutes in a day. The question is about one hour: 3,600 seconds.
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