Subject: General Aptitude · Chapter: Time and Work · Exam: · Marks: · Difficulty:
A can do a piece of work in 10 days working 8 hours per day. If B is two-thirds as efficient as A, then in how many days can B alone do the same piece of work, working 5 hours per day?
(a)15
(b)18
(c)20
(d)24
Answer
Answer (as printed): D
Explanation
Time taken by A alone to do the work $= (10 \times 8)$ hrs $= 80$ hrs. Since B is two-thirds as efficient as A, time taken by B to do the work $= \left(80 \times \frac{3}{2}\right)$ hrs $= 120$ hrs. $\therefore$ Required time $= \frac{120}{5}$ days $= 24$ days.
Explanation as extracted from the printed page; notation may be imperfect.