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Question
primary 6 | Maths
| Measurement
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1st bk: ▮ [ 1 unit ]
2nd bk: ▮
3rd bk: ▮ + 15
total = 2h = 120 min
▮ + ▮ + ▮ + 15 = 120
▮ = 35 min
3rd bk took 35+15 = 50 min
...
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