My Wife Is From a Thousand Years Ago - Ch. 145

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Time for Xiao Hong to go from point B to A: 48 (Hong minutes) - 48 (Ming minutes)
You need to convert (Ming minutes) to (Hong minutes); the ratio is found by noting that Xiao Ming gets to run a shorter time of 48-20=28 (Ming minutes), when Xiao Hong runs 10 (Hong minutes) ending up with the the conversion factor of 10/28.
48-(48*10/28)
30.85714286 minutes for Xiao Hong to run from Point B to A.

Is this really elementary school level?
 

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