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 answers:	A) 35 days	B) 60 days	C) 79 days	D) 70 days	E) 65 days
60 days   60 days   A = 140 days   60 days = 105 days   1/140 + 1/105 = 7/420 = 1/60   =&gt;60 days
<result>B</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.