Question 1146303
Each boy's RATE:
x, y, z for Joseph, Bill, Elmer


{{{system(x+y=1/10,y+z=1/12,x+z=1/15)}}}


{{{x+y+y+z+x+z=1/10+1/12+1/15}}}

{{{2x+2y+2z=6/60+5/60+4/60}}}

{{{2x+2y+2z=15/60}}}

{{{2(x+y+z)=1/4}}}

{{{x+y+z=1/8}}}

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{{{x+y+z-(y+z)=1/8-1/12}}}---------this will give value for x, a rate for Joseph; from which you want its reciprocal.


The other two are done similarly.