<PRE><B>Question 1105001</B>
One worker works alone for 15/40  minutes since he can do the job alone in 40 minutes
The two workers work together for 10/x  minutes and 10/40  minutes
10/x+10/40+15/40=1
One worker worked 10 minutes with his partner and 15  minutes  alone for a total of 25 minutes
10/x+25/40=1
10/x=1-25/40
10=(40/40-25/40)*x
10=(40-25/40)*x
10=(15/40)*x
400=15*x
400/15=x
x=26.6666667 minutes if the second worker had done the job alone
check
10/26.6666667+10/40+15/40=1
0.375+25/40=1
0.375+0.625=1
1.0=1
ok
codewtet3
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