A carpenter can do a job in four hours. His assistant can do the same job in six hours. How long would it take them to do the jo
2 answers:
if the carpenter can do the whole job in 4 hours, that means in 1 hour, it has only done 1/4 of the whole thing.
if his assistant can do the job in 6 hours, that means, in 1 hour, he has done only 1/6 of the whole job.
let's say if both of them work together, they can do the job in "t" hours, so in 1 hour alone, the carpenter has done 1/4 of it, and the assistant has done 1/6 of it, for a total of 1/t of the job.
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