Time and Work

$P$ is $30\%$ more efficient than $Q. P$ can complete a work in $23$ days. If $P$ and $Q$ work together, how much time will it take to complete the same work?

A can complete a piece of work in 18 days. B is 20% more efficient than A. The number of days B takes to complete the same piece of work is ?

6 men or 10 boys can complete a piece of work in 15 days. if 7 men and x boys complete the same piece of work in 9 days, then x is equal to

Ramu can complete a job in 8 days, Shyamu can complete the same job in 12 days. However , Monu takes 12 days to complete $\displaystyle \frac{3}{4}$th of the same job. Ramu works for 2 days and then leaves the job,. The number of days that will be taken by Shaymu and Monu to balance together is

A contractor employed $210$ men to build a house in $60$ days. After $12$ days, he was joined by $70$ more men. In how many days will the remaining work be finished?

$A$ alone can do a piece of work in $15$ days to that of $B$ alone can do it in $10$ days. If $B$ works at it for $5$ days and then leaves, then $A$ alone can finish the remaining work in _________.

A can do a piece of work in $14$ days and B in $21$ days. They begin together, but $3$ days before the completion of the work, A leaves off. In how many days is the work complete?

Mark the correct alternative of the following. $12$ men can finish a piece of work in $25$ days. The number of days in which the same piece of work can be done by $20$ men, is?

Two man undertook to do a job for Rs.$1400$. One of them can do it alone in $7$ days and the other in $8$ days. With the assistance of a boy, they together completed the work in $3$ days. How much money did the boy get ?

Ram and Shyam works on a job together and finish 60% of it. Ram then takes leave and Shyam works for eight more days to complete the work. How long will it take Ram to complete the work?

Working simultaneously and independently at an identical constant rate, four machines of a certain type can produce a total of x units of product P in 6 days.How many of these machines, working simultaneously and independently at this constant rate, can produce a total of 3x units of product Pin 4 days?