Susan and kate while working together can complete a piece of work in 50 hours while kate alone in 90 hours how long will susan take to completed

Ravi can do a piece of work in 15 hours while Raman can do it in 12 hours. How long will both take to do it, woking together?

A and B working together can do a piece of work in 12 days and A alone can caomplete the work in 18 days. How long will B alone take to complete the job?

A can finish a piece of work in 12 hours while B can finish it in 15 hours. How long will both take to finish it, working together?

A and B together can do a piece of work in 12 days and A alone can complete the work in 18 days. How long will B alone take to complete the job ?

A and B together can do a piece of work in 12 days and A alone can complete the work in 18 days. How long will B alone take to complete the job ?

A takes 5 hours more time than that taken by B to complete a work. If working together they can complete a work in 6 hours, then the number of hours that takes to complete the work individually is