A can complete a piece of work in a days by working m hours per day, and B can complete the same work in b days by working n hours per day. If each of...
Question
A can complete a piece of work in a days by working m hours per day, and B can complete the same work in b days by working n hours per day. If each of them reduces their working hours per day by 4 hours, each would take 5 days more to finish the work. Given that m, n < 16 and m, n, a, b are all integers, what is the time taken if A and B start working together such that A works for m hours per day and B works for n hours per day?
Choose the correct option(s) from the following: