A can complete a work in 5 days and B can complete the same work in 10 days. If A and B work alternately, starting with A, in how many days will they complete the work?
Answer & explanation
Correct answer: option 2
A = 5 days, B = 10 days,
⇒ As A and B works alternatively, starting with A,
1st day = 2 units
2nd day = 1 unit
Every 2 days = 3 units of work,
Therefore, in 6 days, 9 units of work will be completed
Hence, in \( { 6}_{2 }^{1 } \) days, 10 units of work will be completed.