SOLUTION: Mr. Downey can build a wall in 9 hours. His son Carl can build the same wall in 18 hours. Mr. Downey started to build the wall, worked for 3 hours, and then stopped working. How m
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Question 1193094: Mr. Downey can build a wall in 9 hours. His son Carl can build the same wall in 18 hours. Mr. Downey started to build the wall, worked for 3 hours, and then stopped working. How many hours would Carl require to complete the wall? Found 2 solutions by ikleyn, josgarithmetic:Answer by ikleyn(52899) (Show Source):
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Mr. Downey can build a wall in 9 hours. His son Carl can build the same wall in 18 hours.
Mr. Downey started to build the wall, worked for 3 hours, and then stopped working.
How many hours would Carl require to complete the wall?
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Working for 3 hours, Mr. Downey completed 1/3 of the job; 2/3 of the job remained.
Hence, his son Carl needs 2/3 of 18 hours to complete the remaining job.
ANSWER. Carl needs 12 hours to complete the job.
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