A man can swim 6 km / hr in still water. If river's rate is 2 km / hr, it takes the man 3 hours to row to a place and back. How far is the place ?
Man's rate in upstream=( 6 - 2 ) km/hr = 4 km/hr
Man's stream rate in downstream= ( 6 + 2 ) km/hr = 8 km/hr
Let the distance of the place be x km then,
=> x/4+x/8 = 3 hrs
=> x = 8kmph
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