A can do a half of certain work in 70 days and B one third of the same in 35 days. They together will do the whole work in?
Select the correct option:
A) 1/65 B) 1/62 C) 1/63 D) 1/60 E) 1/61
A = 140 days   B = 105 days   1/140 + 1/105 = 7/420 = 1/60   =&gt;60 days   Answer: 1/60
<result>D</result>
A can do a half of certain work in 70 days and B one third of the same in 35 days. They together will do the whole work in?