The amount of work done by Kalon in an hour is equal to 1/4. This is based on his time to finish the job. Letting x be the number of hours Marna can finish the job alone will let her finish 1/x of the job in an hour. If their rates are added together and multiplied by the number of hours they worked together, the product should be one whole job. (1/4 + 1/x)(1 5/7) = 1 The value of x is 3. Therefore, it will take 3 hours for Marna to clean the chimney alone.
Salesman B has no cap and get commission for everything he sells so how much he could make is over A because he has a cap and C doesn’t get commission.