List of top Quantitative Aptitude Questions on Time & Work asked in BHU PET

If 'A' and 'B' can do a piece of work in 8 days, while 'A' alone can do it in 12 days. In how many days can 'B' alone do the same work?
2 men and 5 boys can finish a piece of work in 4 days, while 3 men and 6 boys can finish it in 3 days. The time taken by one man alone to finish the work is:
A tank can be filled by two taps A and B in 12 hours separately. The full tank can be emptied by a third tap in 8 hours. If all the taps are turned on at the same time, then the time taken to fill the empty tank will be: