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Hi! Can someone please help me? Julie an experienced bricklayer can build a wall in 55 hours, while her daughter can do the job in 66
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Hi! Can someone please help me?
Julie an experienced bricklayer can build a wall in 55 hours, while her daughter can do the job in 66 hours. How long will it take for them to build the wall together?
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Mathematics
5 months
2021-09-05T15:15:12+00:00
2021-09-05T15:15:12+00:00 1 Answers
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Answers ( )
Answer:
30 hrs
Step-by-step explanation:
In 1 hour, J completes 1/55 of job
In that time, D completes 1/66 of job
J + D together complete 1/55 + 1/66 of the job in 1 hour
1/55 + 1/66 = 1/30
Together, it takes them 30 hours to build the wall.