Time and Work

A can build a wall in $25$ days and $B$ can demolish the same wall in $80$ days and $C$ can build the same wall in $60$ days. If they work on consecutive day one after another starting from $A$ on the first day. Then in how many days will the work be completed?

A and B can together complete a piece of work in $10$ days and B and C in $20$ days. A works at it for $ 4$ days, B for $6$ days and C later completes it in $22$ days. The time taken by C alone to do the work is ?

$A$ can finish a work in $18$ days and $B$ can do the same work in half the time taken by $A$. What part of the same work they can finish in a day if they work together?

A does $\dfrac { 4 } { 5 }$ of a work in $20$ days. He then calls in $\mathrm { B }$ and they together finish the remaining work in $3$ days. How long $\mathrm { B }$ alone would take to do the whole work?

A contractor undertakes to dig a canal, $6$ kilometers long in $35$ days and employed $90$ men. He finds that after $20$ days only $2$ km of canal have been completed . How many more men must be employed to finish the work in time?

A alone can do a piece of work in $10$ days , B can do it in $12$ days, They worked for $4$ days and then the remaining work was completed by C in $ 8$ days. If they under took Rs. $7280$ to do it, then what is the share of B?

Kamlesh worked $27$ days and completed $75$ percent of particular work. Then he took help of Lucifer and they together completed the remaining work in $5$ days . How long will Lucifer take to complete the same work, if he is working alone?

A particular work can be completed by $6$ men and $6$ women in $24$ days, whereas the same work can be completed by $8$ men and $12$ women in $15$ days. Find the time taken by $4$ men and $6$ women to complete the same work .

A contractor estimates that $3$ persons could rewire Jasminders house in $4$ days. If he uses $4$ persons instead of three, how long should they take to complete the job?

In order to complete a work in $28$ days, $60$ men are required. How many men will be required if the same work is to be completed in $40$ days?

If $12$ men or $18$ women can complete a piece of work in $7$ days , then in how many days can $4$ men and $8$ women complete the same work ?

A and B can complete work together in 5 days. If A works at twice his speed and B at half of his speed this works can be finished in 4 days. How many days would it take for A alone to complete the job ?

A contractor undertakes to build a wall $1000$ m long in $50$ days . He employes $56$ men , but at the end of $27$ days, he find that only $448$ m of wall is built. How many extra men must the contractor employ so that the wall is completed in time ?