A can do a piece of work in 2 days, and B can do five times the same work in 15 days when they work for ten hours a day. If they work together, then how many hours in addition to a days’ work will they require to complete the work?
Answer & explanation
Correct answer: option 1
A = 2 days, x 10 hours = 20
B = 5A = 15 days, B = 3 days, x 10 hours = 30
⇒ So, A + B will complete the work in = \(\frac{60}{5}\) = 12 days. ..(\(\frac{Work}{Efficiency}\) = Time )
⇒ So extra time, 12 -10 = 2 hours.
Therefore, the additional work time will be 2 hours.