WBCS.LIVE practice question

A can do a piece of work in 10 days and B can do the same work in 15 days. How many days will they take to complete it together?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 5 days
  2. 12 days
  3. 8 days
  4. 6 days

Correct answer and explanation

Correct answer: 6 days

Explanation: ✅ Correct Answer: D) 6 days 📚 Explanation: A's one day of individual work is 1÷10, and B's one day of individual work is exactly 1÷15. Together, their combined one day of work is (1÷10) + (1÷15), which mathematically simplifies to 5÷30 = 1÷6. Therefore, working completely together, they will finish the entire task in exactly 6 days.