Answers

2015-05-25T16:36:32+08:00
The washed the clothes for 3 hours or 180 minutes.
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2015-05-25T16:37:59+08:00

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To find how many hours before she finished:
10:30 AM-7:30 AM=3:00 meaning 3 hours

Conversion:
1 hour=60 minutes

Convert:
3 hours(\frac{60 minutes}{1 hour})=180 minutes

Hope this helps=)
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