A man and a boy together can do a certain amount of digging in 40 days. Their speeds in digging are in the ratio of 8 : 5. How many days will the boy take to complete, the work it engaged alone? `2\ d a y s` b. `68\ d a y s` c. `80\ d a y s` d. `104\ d a y s`

A job can be done by 3 skilled worksmen in 20 days or by 5 boys in 30 days. How many days will they take if they work together? 8 d a y s b. 10 d a y s c. 12 d a y s d. 11 d a y s

X can do a piece of work in 40 days. He works at it for 8 days and then Y finished it in 16 days. How long will they together take to complete the work ? 13 1/3 d a y s b. 15 d a y s c. 20 d a y s d. 56 d a y s

12 men complete a work in 9 days. After they have worked for 6 days, 6 more men join them. How many days will they take to complete the remaining work? 2 d a y s b. 3 d a y s c. 4 d a y s d. 5d a y s e. none of these

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 team of workers was employed by a contractor who undertook to finish 360 pieces of an article in a certain number of days. Making four more pieces per day than was planned, they could complete the job a day ahead of schedule. How many days did they take to complete the job? 8 d a y s b. 12 d a y s c. 9 d a y s d. 10 d a y s

3 men or 6 women can do a piece of work in 20 days. In how many days will 12 men and 8 women do the same work? 3 1/2d a y s b. 3 3/4d a y s c. 4\ d a y s d. 5\ d a y s

A can do a work in x days while B can do the same work in y days then in how many days will they complete the work, working together?