Jenny need to reach her teacher house by $$2.15 \rm{p.m}$$ for piano class. From her house to teacher\textquotesingle s house, she need to walk for $$20$$ minutes. She was late for $$10$$ minutes. What time did she leave her house? 
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She reached at $$2.25 \rm{p.m.}$$, thus, $$20$$ minutes before that is $$2.05 \rm{p.m.}$$ 