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 second was recalled, and the first completed the job itself in 5 hours. How many hours did they work together, and how much did each of them do?

Correct result:

x =  15 h
a =  0.5
b =  0.5


 x (1/40+1/30)+5/40=1  7x=105  x=15=15 h

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