A can do a half of certain work in 60 days and B one third of the same in 35 days. They together will do the whole work in.  Choose one.
A) 56 days  B) 420 days  C) 46 days  D) 560 days  E) 96 days
56 days = 120 days   B = 105 days   1/120 + 1/105 = 45/2520 = 1/56   =&gt;56 days   56 daysNSWER:56 days
<result>A</result>
A can do a half of certain work in 60 days and B one third of the same in 35 days. They together will do the whole work in.