A man can row 9km/hrin still water. it takes him twice as long to row upas to row down the river find the rate of the stream Rate of the current ? Answers:
A) 2km/hr B) 63.8km/hr C) 8.9km/hr D) 9.6km/hr E) 7.9km/hr
Lets man's rate in upstream =xkm/hr.   man's rate down stream =2xkm/hr. man's rate in still water =1/2(x+2x)km/hr ==&gt;3x/2=6==&gt;x=4 The rate upstream=4km/hr . The rate down stream=8km/hr. Rate of the current=1/2(8-4)km/hr=2km/hr   2km/hrnswer is (2km/hr)
<result>A</result>
A man can row 9km/hrin still water. it takes him twice as long to row upas to row down the river find the rate of the stream Rate of the current ?