A boat covers a certain distance downstream in I hour, while it comes back in 1½ hours. If the speed of the stream be 3 kmph. what is the speed of the boat in still Water?
Select
A) 12kmph
B) 13kmph
C) 15kmph
D) 16kmph
E) 18kmph
suppose it travels 1 km downstream in 1 hr and upstream in 1.5 hrs.   speed of boat in still water is x, then   1= 1/(x+3)   1.5= 1/(x-3)   solving we get   x= 15 kmph   ANSWER:15kmph
<result>C</result>
A boat covers a certain distance downstream in I hour, while it comes back in 1½ hours. If the speed of the stream be 3 kmph. what is the speed of the boat in still Water?