Two workers, A and B, will be done work together for 15 days. They worked together for 13.5 days. Then A worker became ill, and worker B finished the job alone for 7.5 days.

If every worker was working alone, how many days took the whole work for workers A and B?

Correct answer:

A =  18.8 d
B =  75 d

Step-by-step explanation:

A=1/(1/151/(7.5/(113.5/15)))=18.8 d
A1+B1=151  r=113.5/15=0.1 r....7.5 1....B  B=7.5/r=75 d  A1+B1=151 A1=151B1 A=151B11=18.75 

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