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.
Choose the correct choice from the following options.
A) 77 days B) 55 days C) 44 days D) 60 days E) 33 days
A = 140 days   B = 105 days   1/140 + 1/105 = 7/420 = 1/60   =&gt;60 days   Answer: 60 days
<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.