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Questions(172)
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Two pipes A and B can fill a tank in $12$ hours and $15$ hours respectively. If both pipes are opened together in an empty tank, how much time will it take to fill it?
$10$ men can reap a field in $20$ days$. 10$ men reaped the field for $10$ days and after $10$ days $10$ more men join them. When will the work be finished?
Pipes A and B can fill a tank in $5$ and $6$ hours respectively. Pipe C can empty it in $12$ hours. If all the three pipes are opened together, then the tank will be filled in:
A contractor estimates that he can have the building construction completed in $40$ days by employing $15$ workers. After $12$ days of work, the work is paused for a week since he runs out of the building materials. How many workers must he add so that the building construction can be completed in time?
A and B alone can do a work in $x$ and $y$ days respectively and C takes $\dfrac{2}{3}\text{rd}$ of total time taken by B to complete same work. If B works with half of it’s efficiency, then A and B can do $16\dfrac{2}{3}\%$ less than that of total work in $11$ days. If C works with half of it’s efficiency, then B and C can do $41\dfrac{2}{3}\%$ less than that of total work in $\dfrac{11}{2}$ days. Find time taken by A to complete total work.
A, B and C are three friends with different efficiencies. A working alone needs as much time as B and C working together, while B himself needs $8$ hours more working alone than when he works with C. A working alone needs $8$ hours less than B needs working alone. In how much time A, B and C working together can complete the job?
$420$ females can finish a certain piece of work in $20$ days. After they began to work, $20$ females left the work after every $5$ days. Find the number of days required to complete the work.
A and B together can do a work in $16$ days, which B and C together can do in $32$ days. After A has been working at it for $15$ days and B for $13$ days, C finished it in $10$ days. In how many days A and C alone will do the work respectively?
A and B working together take $8$ and $18$ days less than A alone and B alone respectively doing the work. Number of days taken by A and B working together to do the work is
(a)$10~~$(b)$11~~$(c)$12~~$(d)$13$
Raju can do $25\%$ of a piece of work in $5$ days. How many days will he take to complete the work ten times?