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Time and Work Questions and Answers
Q1. A can do a piece of work in 4 hours; B and C together can do it in 3 hours, while A and C together can do it in 2 hours. How long will B alone take to do it ?
A. 10 hours
B. 24 hours
C. 12 hours
D. 8 hours
Q2. A and B can do a work in 8 days, B and C can do the same work in 12 days. A, B and C together can finish it in 6 days. A and C together will do it in :
A. 8 days
B. 6 days
C. 4 days
D. 12 days
Q3. 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. 8 days
B. 4 days
C. 6 days
D. 18 days
Q4. A and B can together finish a work in 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the job ?
A. 40
B. 50
C. 60
D. 54
Q5. P can complete a work in 12 days working 8 hours a day. Q can complete the same work in 8 days working 10 hours a day. If both P and Q work together, working 8 hours a day, in how many days can they complete the work ?
A. 72/11
B. 71/11
C. 61/11
D. 60/11
Q6. A, B and C can complete a piece of work in 24, 6 and 12 days respectively. Working together, they will complete the same work in :
A. 4 day
B. 24/7 day
C. 7/24 day
D. 1/24 day
Q7. A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days ?
A. 13 days
B. 18 days
C. 11 days
D. 15 days
Q8. A takes twice as much time as B or thrice as much time to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in :
A. 12 days
B. 6 days
C. 8 days
D. 4 days
Q9. A can do a certain work in the same time in which B and C together can do it. If A and B together could do it in 10 days and C alone in 50 days, then B alone could do it in :
A. 20 days
B. 15 days
C. 25 days
D. 30 days
Q10. 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. 47/6 days
B. 47/3 days
C. 10 days
D. 5 days