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If John can complete a job in 8 hours and Sara can complete the same job in 12 hours how long will it take them to complete the job together ?

A5 hours

B6⅔ hours

C4⅘ hours

D7½ hours

Answer:

C. 4⅘ hours

Read Explanation:

total work = lcm(8, 12) = 24 efficiency of John = 24/8 = 3 efficiency of Sara = 24/12 = 2 efficiency of John and Sarah together = 3 + 2 = 5 the time taken by Sara and join to complete the job together = total work / efficiency = 24/5 = 4⅘


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