Pre placement 3

A and B can complete a work in 12 days. B and C together can do it in 15 days. If A is twice as good a workman as C, find it what time B alone can do it.

• 15 days
• 20 days
• 25 days
• 60 days

10 persons begin to work together on a job but after some days 4 persons leave. As a result, the job which could have been completed in 40 days is completed in 50 days. How many days after the commencement of the work did the 4 persons leave ?

• 20 days
• 18 days
• 25 days
• 30 days

3 men and 4 women can earn 3780 rupees in 7 days. 11 men and 13 women can earn 15040 in 8 days. In what time will 7 men and 9 women earn 12400 ?

• 8 days
• 10 days
• 12 days
• 9 days

A can complete a certain work in 4 minutes, B in 5 minutes, C in 6 minutes, D in 10 minutes and E in 12 minutes. The average number of units of work is completed by them per minute will be

• 0.16
• 0.40
• 0.80
• None of these

George takes 8 hours to copy a 50- page manuscript while sonia can copy the same manuscript in 6 hours. How many hours would it take them to copy a 100-page manuscript, if they work together

• 48/7
• 9
• 68/7
• 14

P, Q, and R are three typists who working simultaneously can type 216 pages in 4 hours. In one hour, R can type as many pages more than Q as Q can type more than P. During a period of five hours, R can type as many pages as P can during seven hours. How many pages does each of them type per hour?

• 14 ,17 ,20
• 15, 18, 21
• 15, 17, 22
• 16, 18, 22

Kamal can do a work in 15 days. Bimal is 50% efficient than Kamal. The number of days, Bimal will take to do same piece of work, is

• 12
• 14
• 10
• 16

A sum of money is sufficient to pay A' s wages for 21 days and B' s wages for 28 days. The. Same money is sufficient to pay the wages for both for

• 12 days
• 14 days
• 20 days
• 49/2 days

A man, a woman and a boy can complete a job in 3, 4 and 12 days respectively. How many boys must assist 1 man and 1 woman to complete the job ?

• 1
• 4
• 19
• 41

A man and a boy together can do a certain amount of digging in 40 days. Their speeds in digging are in the ratio 8: 5 . How many days will the boy take to complete the work if engaged alone ?

• 52 days
• 68 days
• 80 days
• 104 days