Karim can do `1/4` of a work in 5 days. How many days will he take to complete the work?

If A can do a work in 10 days and B can do the same work in 15 days, then how many days will they take to complete the work both while working together?

A can complete a work in 'm' days and B can complete it in 'n' days. How many days will it take to complete the work if both A and B work together?

A can do (1)/(4) part of a work in 21 days and B can do (1)/(4) part of a work in 7 days. In how many days will A and B complete the total work ?

A can do a certain work in 15 days, while working together, A and B can do the same work in 7.5 days. How many days will B alone take to do the same work ?

A can do a certain work in 15 days, while working together, A and B can do the same work in 7.5 days. How many days will B alone take to do the same work?

A can do a piece of work in certain number of days, while B takes three days more than A to complete the same work. Working together, A and B can complete the work in two days. How many days does B take to complete the work?

Acan do a work in 6 days and B in 9 days. How many days will both take together to complete the work?

15 persons working 8 hours a day can complete a work in 21 days.How many days will 14 persons take to complete a work 1(1)/(2) xx as great,if they work 6 hours a day?