Finding a solution for ratio problem

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I understand how to get the answer but can't we write explicitly the condition as a equation? I mean i have done this with length process, I need a quick process.

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I am not sure if I understand your question, but wouldn't simply adding speeds serve your purpose? $\frac{1plot}{2h} + \frac{1plot}{4h} = \frac{6plots}{8h} = \frac{3 plots}{4h} = \frac{1plot}{4/3 h}$