A man complete a job in four days working ten hours a day. In how many days can he complete it if he works eight hours a day?
Answer & explanation
Correct answer: option 1
The total work is constant.
Total work done:
$4 \text{ days} \times 10 \text{ hours/day} = 40 \text{ hours}$
If he works 8 hours per day, the number of days required is:
$\frac{40}{8} = 5 \text{ days}$