Sally can paint a room in 7 hours while it takes Steve 6 hours to paint the same room. How long would it take them to paint the room if they worked together.

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27-10-2014
Mathematics

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Sally can paint a room in 7 hours while it takes Steve 6 hours to paint the same room. How long would it take them to paint the room if they worked together.

Sagot :

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ollieboyne ollieboyne · Answer 1 · 2014-10-28T15:37:35-04:00

ollieboyne ollieboyne

28-10-2014

Sally paints at a rate of 1/7th room / hour

Steve paints at a rate of 1/6th room / hour

If they both painted together, they would paint 1/7 + 1/6 = 13/42 room/hour

so to paint the whole room, it would take 1/(13/42) = 42/13 =

3.23 hours (3 significant figures)

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