Two workers

The first worker completed the task by himself in 9 hours, the second in 15 hours. After two hours of joint work left first worker to a doctor and the second finished the job himself. How many hours worked second worker himself?

Correct result:

x =  9.67 h

Solution:


2(1/9+1/15)+x/15=1

2•(1/9+1/15)+x/15=1

3x = 29

x = 293 ≈ 9.666667

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