Alfonso can do a certan job in 1 hour. His brother can do the same job in 1 hour however, their older sister Josefa can do this jobin 45 minute. If all three work together, how long will it take them to

Alfonso can do a certan job in 1 hour. His brother can do the same job in 1 hour however, their older sister Josefa can do this jobin 45 minute. If all three work together, how long will it take them to do the job?

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Alfonso can do a certan job in 1 hour. His brother can do the same job in 1 hour however, their older sister Josefa can do this jobin 45 minute. If all three work together, how …

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