Susan can type 10 pages in 5 minutes. Mary can type 5 pages in 10 minutes. Working together, how many pages can they type in 30 minutes?
সমাধান
সঠিক উত্তর: Option E
In one minute, Susan, does one page:
(5/10)=1/2
Mary, does one page:
(10/5)=2
So, both do :
Net-work: (2+1/2)=5/2
Thus ,
1 minute work done: 5/2
So, In 30-minutes : 30 * (5/2) = 75 pages
