Ravi can do a piece of work in 28 days while Prakash can do it in 40 days. In how many days will they finish it together?
Choose the most appropriate option: A) 16 1/17 days B) 17 1/8 days C) 16 8/17 days D) 17 7/17 days E) 18 1/17 days
1/28 + 1/40 = 17/280   280/17= 16 8/17 days   Answer: 16 8/17 days
<result>C</result>
Ravi can do a piece of work in 28 days while Prakash can do it in 40 days. In how many days will they finish it together?