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primary 5 | Maths
| Rate & Ratio
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2h —> 1 chair
1h —> 1/2 chair
Fred,
3h —> 1 chair
1h —> 1/3 chair
Together in 1h —> 1/2 + 1/3 = 5/6 chair
5/6 chair —> 1h
1/6 chair —> 1/5h
6/6 (1) chair —> 6/5h = 1h 12mins
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