Question 880148
One man rate, {{{1/(15*210)=1/(3150)}}} job per day.
RT=J uniform rates for doing a job or task.


10 days____________{{{15(1/3150)*10=0.04762}}}
20 days____________{{{30(1/3150)*10+15(1/3150)*10=0.14286}}}
30 days____________{{{45(1/3150)*10+30(1/3150)*10+15(1/3150)*10=0.2857}}}
40 days____________{{{60(1/3150)*10+30(1/3150)*10+15(1/3150)*10=0.47619}}}
50 days____________{{{75(1/3150)*10+30(1/3150)*10+15(1/3150)*10=0.71429}}}
60 days____________{{{90(1/3150)*10+30(1/3150)*10+15(1/3150)*10=highlight(1)}}}


<b>60 days</b>.