SOLUTION: (a) if 5/7 of a room can be painted in 1hr, what is the rate of work? of the room per hour. (b) At the same rate, how long will it take to paint the entire room?

Algebra ->  Rate-of-work-word-problems -> SOLUTION: (a) if 5/7 of a room can be painted in 1hr, what is the rate of work? of the room per hour. (b) At the same rate, how long will it take to paint the entire room?       Log On


   

Question 629210: (a) if 5/7 of a room can be painted in 1hr, what is the rate of work? of the room per hour.
(b) At the same rate, how long will it take to paint the entire room?
Found 2 solutions by josmiceli, ewatrrr:
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
If 5/7 of a room can be painted in 1 hour
then 7 times that, or +7%2A%285%2F7%29+ = 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 +%287%2F5%29%2A60+=+84+
and +84+-+60+=+24+
So, 1 room can be painted in 1 hour and 24 minutes

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

(a) if 5/7 of a room can be painted in 1hr (60min)  ⇒  1/7 per 12min

(b) At the same rate, how long will it take to paint the entire room? 

     7 * 12min = 84min  or 1.4 hr