In one hour a boat goes 18 km long the stream and 6 km against the stream.The speed of the boat in still water is?  Choose the correct answer:
A) 12
B) 14
C) 16
D) 17
E) 18
Speed in still water 12 = ½ ( 18+6) km/hr 12= 12 kmph   12nswer: 12
<result>A</result>
In one hour a boat goes 18 km long the stream and 6 km against the stream.The speed of the boat in still water is?