In one hour a boat goes 13 km long the stream and 9 km against the stream.The speed of the boat in still water is?  Choose the correct choice from the following answers:  A) 17  B) 18  C) 16  D) 15  E) 11
Speed in still water A = ½ ( 13+9) km/hr A= 11 kmph   Answer: 11
<result>E</result>
In one hour a boat goes 13 km long the stream and 9 km against the stream.The speed of the boat in still water is?