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. Pick:	A) 88 days	B) 27 days	C) 78 days	D) 60 days	E) 17 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.