Work and Time

The following table gives the information regarding the number of persons employed to a piece of work and time taken to complete the work: No.of persons: 2,4,6,8 Time taken ( in days): 12,6,4,3 Plot a graph of this information.

If an agent does a work W in time t, then power is given by :

A can do a piece of work in 8 hours while B aline can do it in 12 hours. Both A and B working together can finish the work in time ?

A contractor undertook a work to complete in 60 days. But just after 20 days he observed that only (1)/(5)th of the project work had been completed. To complete the work in time in rest days minimum how many workers he had to increase, if there were initially 75 workers were deployed for the task?

A works 3 times as fast as B. If B can complete a work in 60 days, then in how many days can A and B together complete the same work ?