Boats and Streams on Arithmetic Aptitude related Questions and Answers

Question :   A boat covers a certain distance downstream in 1 hour, while it comes back in 3/2 hours. If the speed of the stream be 3 kmph, what is the speed of the boat in still water? 1. 12 kmph 2. 13 kmph 3. 18kmph 4. 15 kmph Answer :   4 - 15 kmph