Assume the distance between Townsend and Smallville is X,
the time consumed from Townsend to Smallville is X/40,
and the time consumed from Smallville to Townsend is (X/40)*3/2,
so clearly the total time spent equals 2X/[X/40+(X/40)*3/2]=32.

Hope it explains clearly to you.

5=2+3, is 1/5=1/2+1/3?
Hope it helps.

Yes, if M and N are both positive intergers, the answer shall be A.

Ron, in E, that is omitted. Is it why E is wrong?

IMO both plan on and plan to are idiomatic. In this case, however, plan to is more simplified.

I will go with B too. The banks want to tackle the existing conterfeiting issue now. Whether counterfeiters can evolve a better technology in the future is an irrelevant factor. The plan is based on the assumption that the counterfeiters are focusing on counterfeiting corporate customers checks. Wha...