A man can raw 10.2 km down stream in 18 minuts .If the speed of strem is 3.5 km/hr.How much time he would take to cover 121.5km upstream?
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man speed= 10.2/0.3 = 34km/hr man speed= man sppedalone + stream speed
man speed alone = 34-3.5= 30.5 km/hr
to cover 121.5km he takes = 121.5/30.5= 3.98hours
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