Time and work. Numerical Reasoning. Test 03

A can do a piece of work in 7 days of 9 hours each, and B can do it in 6 days of 7 hours each. How long will they take to do it, working together 8 2/5 hours a day?

A can do piece of work in 30 days while B alone can do it in 40 days. In how many days can A and B working together do it?

12 men can complete a piece of work in 4 days, while 15 women can complete the same work in 4 days. 6 men start working on the job and after working for 2 days, all of them stopped working. How many women should be put on the job to complete the remaining work, if it is to be completed in 3 days?

A and B together can complete a work in 12 days. A alone can complete it in 20 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work?

A and B can do a piece of work in 30 days, while B and C can do the same work in 24 days and C and A in 20 day. They all work together for 10 days, after which B and C leave. How many days more will A take to finish the work?

A is 50% as efficient as B. C does half of the work done by A and B together. If C alone does the work in 40 days, then A, B and C together can do the work in

A works twice as fast as B. If B can complete a work in 12 days independently, the number of days in which A and B can together finish the work is

A can do a job in 16 days, and B can do the same job in 12 days. With the help of C, they did the job in 4 days. Then, C alone can do the job in

32.tA does 4/5 of the work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone take to finish the whole work?

30.tA and B take 15 and 20 days respectively. They worked for 4 days, and then the fraction of work left was