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 finish the job alone for 7.5 days.

If every worker was working alone, how many days took whole work for worker 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)))=754 d=18.8 d
1A+1B=115  r=113.5/15=0.1 r....7.5 1....B  B=7.5/r=75 d  1A+1B=115 1A=1151B A=11151B=18.75 

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