Time And Work(Quantitative Aptitude ) Questions and answers for exam Preparation

Quantitative Aptitude

TIME AND WORK MCQs

Time & Work, Work And Wages

Total Questions : 1512 | Page 152 of 152 pages

Question 1511. A and B can do a piece of work in 72 days; B and C can do it in 120 days; A and C can do it in 90 days. In what time can A alone do it ?

80 days
100 days
120 days
150 days

Discuss Question

Answer: Option C. -> 120 days
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1512. X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last ?

6 days
10 days
15 days
20 days

Discuss Question

Answer: Option B. -> 10 days
WORK DONE BY X IN 4 DAYS = ( 1/20X 4 ) = 1/5 REMAINING WORK = (1 – 1/5 ) = 4/5 (X + Y)’S 1 DAY’S WORK = 1/20 + 1/12 = 8/60 = 2/15 NOW, 2/15 WORK IS DONE BY X AND Y IN 1 DAY. SO, 4/5 WORK WILL BE DONE BY X AND Y IN 15/2 X 4/5 = 6 DAYS HENCE, TOTAL TIME TAKEN = (6 + 4) DAYS = 10 DAYS.