A is twice as fast in work as B is. If B can do a piece of work in 10 days, then A can do the same work in:

A works twice as fast as B. If both of them can together finish a task in 12 days, B alone can do it in:

A is thrice as efficient as B and takes 10 days less than B takes to do the same work. In howmany days, B alone can finish the whole work?

A and B together can do a specific work in 8 days. B alone can do it in 10 days, then time taken by A alone is?

A and B can do a work in 30 days. If A worked twice as fast and B worked one-fourth as efficiently as he usually does, the work would still be completed in 30 days. Find the time taken (in days) by A alone to do the work.

If A can do a piece of work in 10 days and B can do the same work in 15 days, how long will they take to complete it together?