If sushi rows 27 km upstream and 81 km down steam taking 9 hours each, then the speed of the stream
Choose the most appropriate option.
A) 12 kmph  B) 13 kmph  C) 22 kmph  D) 20 kmph  E) 15 kmph

Rationale: speed upstream = 27 / 9 = 3 kmph speed down stream = 81 / 3 = 27 kmph speed of stream = ½ ( 27 - 3 ) = 12 kmph answer : a
Answer: A