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Mathematics 5 Online
OpenStudy (anonymous):

Show an equation and a solution for the problem. It takes John 20 hours to paint a building. It takes Sam 15 hours to paint the same building. How long will it take for them to paint the building if they work together, with Sam starting one hour later than John? Round to the nearest tenth.

OpenStudy (anonymous):

ok now it should be easy right? same as the other one you want \[\frac{20\times 15}{20+15}\]

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