Two men, Vikash and Neeraj, working separately can mow a field in 8 and 12 hrs. respectively. If they work 1 hr alternately, Vikash beginning at 9 am, when will the plugging be finished?
1
8 : 30 pm
2
6 : 30 pm
3
7 : 30 pm
4
9 : 30 pm
Two men, Vikash and Neeraj, working separately can mow a field in 8 and 12 hrs. respectively. If they work 1 hr alternately, Vikash beginning at 9 am, when will the plugging be finished?