A can do in one day three times the work done by B in one day. They together finish `2/5` of the work in 9 days. The number of days by which B can do the work alone is a. `30\ d a y s` b. `90\ d a y s` c. `100\ d a y s` d. `120\ d a y s`

Some persons can do a piece of work in 12 days. Two times the number of such persons will do half of that work in 6\ d a y s b. 4\ d a y s c. 3\ d a y s d. 12\ d a y s

Working 8 hours a day, 12 men can do a work in 30 days. Working 4 hours a day, 18 men can do the work in 30 d a y s b. 40 d a y s c. 45 d a y s d. 50 d a y s

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 4 d a y s b. 6 d a y s c. 8 d a y s d. 18 d a y s

A and B together can do a piece of work in 30 days. A having worked for 16 days, B finishes the remaining work alone in 44 days. In how many days shall B finish the whole work alone ? a. 30 d a y s b. 40 d a y s c. 60 d a y s d. 70 d a y s

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: 13 1/3d a y s b. 15 d a y s c. 20 d a y s d. 30 days

A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in : a. 4 days b. 6 d a y s c. 8 d a y s d. 12 d a y s

A does 4/5 of a work in 20 days. He then calls B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work ? a. 23 d a y s b. 37 d a y s c. 37 1/2 d a y s d. 40 d a y s

A can do a piece of work in 5 days, B can do it in 10 days. With the help of C, they finish the work in 2 days. In how many days C alone can do the whole work?

A can do a piece of work in 10 days, B can do it in 15 days working together they can finish the work in :

A and B can do a piece of work in 12 days, B and C in 8 days and C and A in 6 days. How long would B take to do the same work alone? a. 24 d a y s b. 32 d a y s c. 40 d a y s d. 48 d a y s