Question. Ravi can do a piece of work in 11 days while Prakash can do it in 22 days. In how many days will they finish it together?
Options:
(A) 5 7/3 days
(B) 7 1/3days
(C) 5 1/9 days
(D) 5 7/3 days
(E) 4 7/9 days
Answer. (B)
What step-by-step reasoning justifies that answer?
Reasoning: 1/11 + 1/22 = 3/22
22/3 = 7 1/3 days