Two workers

One worker needs 40 hours to do a job, and the second would do it in 30 hours. They worked together for several hours, then the company recalled the second, and the first completed the job in 5 hours. How many hours did they work together, and how much did each of them do?

Correct answer:

x =  15 h
a =  1/2
b =  1/2

Step-by-step explanation:

x (401+301)+405=1  x (1/40+1/30)+5/40=1  7x=105  x=7105=15  x=15=15 h

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