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

45 men can complete a work in 16 days. After working for some days, 30 more men joined the work. As a result, work now finished in 6 days. How many days after the commencement of the work did the 30 persons join?
A piece of work can be done by Ram in 10 days. If Mohan joined him and both together finished the work in 6 days, then the ratio of their one day work is: