20 Solved Questions for Time and Work

Aug 21st, 2016
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20 Solved Questions for Quantitative Aptitude > Time and Wor. Step by step explanations. Very useful and handy for last minute preparation.

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Ex.1.A does a work in 10 days and B does the same work in 15 days. In how many days theytogether will do the same work ?(a) 5 daysSol.(b) 6 days(c) 8 days(d) 9 days(b).A's 1 day's work =11and B's 1 day's work = .10151 1 1 A + B 's 1 day's work n= . 10 15 6So, both together will finish the work in 6 days..Slide 1 of 21Ex.2.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 :713days(a)(b) 24 days(c) 3 days(d) 4 days247Sol.(c). A + B + C 's 1 day's work= 1 1 1 7 .246 12 24So, A, B and C together will complete the job in243 3 days.77Slide 2 of 21Ex.3.A takes twice as much time as B or thrice as much time to finish a piece of work. Workingtogether, they can finish the work in 2 days. B can do the work alone in :(a) 4 daysSol.(b) 6 days(c) 8 days(d) 12 days(b).Suppose A, B and C takes x ,xxand hours respectively to finish the work.231 2 3 1Then, x x x 26 1x 2 x 12.So, B takes 6 hours to finish the work.Slide 3 of 21Ex.4.Two workers A and B are engaged to do a work. A working alone takes 8 hours more tocomplete14the job than if both worked together. If B worked alone, he would need2hours more tocomplete the job than they both working together. What time would they take to

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