A boat can row 18 kmph in still water.It takes twice as long to row up as to row down the river.Find the rate of stream.
Choose one:  A) 6 km/hr  B) 7 km/hr  C) 8km/hr  D) 5 km/hr  E) 9 km/hr
still water-18kmph   It takes twice as long to row up as to row down the river.   then let upstream=2x and downstream=x   now buy the formulae   18=0.5(x+2X)-----&gt;x=12   so stream=0.5*(24-12)= 
<gadget id="calculator">0.5*(24-12)</gadget>
<output>6</output>
6kmph   6 km/hrNSWER:6 km/hr
<result>A</result>
A boat can row 18 kmph in still water.It takes twice as long to row up as to row down the river.Find the rate of stream.