A man can row his boat with the stream at 16 km/h and against the stream in 12 km/h. The man's rate is? Choose the correct answer.
A) 8 kmph  B) 9 kmph  C) 2 kmph  D) 4 kmph  E) 1 kmph

Rationale: "ds = 16 us = 14 s = ? s = ( 16 - 2 ) / 2 = 2 kmph answer : c"
Answer: C