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Before doing his math homework, Nan observed that the minute hand and the hour hand of the clock were between 7 o'clock and 8 o'clock. ...
Let the minute hand speed be 60 bars/hour, the hour hand speed be 5 bars/hour, and Xiaohong's working time be X.

60*x-5*x=3 1

x=3 1/(60-5)

X=0.56 hours =33.8 minutes

Hope to adopt, thank you.

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