Zwen's answer to Jonathan's Primary 5 Maths Singapore question.

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Zwen
Zwen's answer
151 answers (A Helpful Person)
To see better, best to draw model. From here, hope you can find the answer. Ignore the 30 min in the model, it is just what I found when I do the workings. I got 7/6 hrs, which is also 1 1/6hrs.