Question 629210
If  5/7 of a room can be painted in 1 hour
then 7 times that, or {{{ 7*(5/7) }}} = 5 rooms
can be painted in 7 hours.
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To paint 1 room will take 1/5 of that time, or
7/5 of an hour, and {{{ (7/5)*60 = 84 }}}
and {{{ 84 - 60 = 24 }}}
So, 1 room can be painted in 1 hour and 24 minutes