If it takes A four days to dig a certain ditch, whereas B can dig it in 8 days and A, B, C together can dig it in $2 \frac{2}{7}$ days, how long C alone would take to dig it ?
If it takes A four days to dig a certain ditch, whereas B can dig it in 8 days and A, B, C together can dig it in $2 \frac{2}{7}$ days, how long C alone would take to dig it ?
A8
B4
C16
D12