If Rooney can type a document for 30 minutes and John can type the same document for 40 minutes. If Rooney and John start typing the same document at 1st January; 10:00am. At what date and time will they first finish at the same time.
I actually got the answer but I used a crude method of having to write for both of em. I was wondering if there was a better way to solve the problem using algebra or any other method.