One fast typist type some matter in 5hrs and another slow typist type the same matter in 8hrs. If both do combine in how much time they will take to finish.
Choose the correct choice from the following options
A) 10 hr 4 mins
B) 1 hr 4 mins
C) 2 hr 4 mins
D) 3 hr 4 mins
E) 1 hr 14 mins
Fast's 1 hr work = 1/5   slow's 1 hr work = 1/8   1/5 + 1/8 = 13/40   they ll finish in 40/13hrs= 3 1/13 ==&gt; 3 hr 4 mins   ANSWER:3 hr 4 mins
<result>D</result>
One fast typist type some matter in 5hrs and another slow typist type the same matter in 8hrs. If both do combine in how much time they will take to finish.