8. Five marks exercise problems III

$A$ and $B$ can do a piece of work in $12$ days, while $B$ and $C$ can do it in $15$ days whereas $A$ and $C$ can do it in $20$ days. How long would each take to do the same work?

 

Time taken by $A$ $=$  days

 

Time taken by $B$ $=$  days

 

Time taken by $C$ $=$  days