RRB NTPC SAMPLE PAPER - ARITHMETIC - 48

1. A and B can do a work in 12 days. B and C in 15 days. C and A in 20 days. If A, B and C work together, they will complete the work in:

(a) 5 days
(b) days
(c) 10 days
(d) days

2. A is thrice as good a work­man as B and therefore, able to finish a job in 60 days less than B. Working together they will do it in:

(a) 20 days
(b) days
(c) 25 days
(d) 30 days

3. Two pipes A and B can fill a tank in 20 minutes and 30 minutes respectively. If both pipes are opened tog(ether, the time taken to fill the tank is:

(a) 50 minutes
(b) 12 minutes
(c) 25 minutes
(d) 15 minutes

4. If 6 men and 8 boys can do a piece of work in 10 days and 266 men and 48 boys can do the same in 2 days, the time taken by 15 men and 20 boys to do the same type of work will be:

(a) 5 days
(b) 4 days
(c) 6 days
(d) 7 days

5. A and B can do a work in 18 and 24 days respectively. They worked together for 8 days and then A left. The remaining work was finished by B in:

(a) 5 days
(b) days
(c) 8 days
(d) 10 days

Railway Recruitment Board (RRB) NTPC Exams Study Kit

Answer:

1. (c) 2. (b) 3. (b) 4. (b) 5. (b)