A tap fills 3 litres of water in 45 seconds. At this rate, how many litres does it fill in 2 minutes?
- 6
- 8
- 9
- 12
Worked answer
- 2 minutes = 120 seconds.
- 45 s → 3 litres, so 15 s → 1 litre.
- 120 s → 120 ÷ 15 = 8 litres.
Answer: 8 litres
The mistake this question tests
Habit
Minutes and hours in rate
Change 2 minutes to 120 seconds before you use the rate.
How to fix it at home →Wrong answers children often give:
- 6 Minutes and hours in rate
- 9 Calculation slip
More PSLE rate questions
Short answer · 2m
Kara notices that every 6 drops from the loose cap of her sports water bottle together make 5 ml of water
See the answer →Structured · 4mAt 8.00 a.m., a filling machine at Mrs Lim's drink stall began filling empty bottles
See the answer →Structured · 3mTwo printers, Cedar and Maple, each print an identical batch of flyers at a constant rate
See the answer →Structured · 3mAt a bubble-tea stall, two pumps fill an empty rectangular drink dispenser U and an empty cubical drink…
See the answer →MCQ · 1mNurul bought 5 notebooks for $80
See the answer →Structured · 3mAt a garden centre, 5 points are earned for every $4 spent
See the answer →Practise PSLE rate until the mistakes stop.
Three PSLE questions, free, no sign-up. You’ll see exactly where the marks went. Then 7 days of everything for S$4.99.