A man rowed 3 miles upstream in 90 minutes. If the river flowed with a current 2 miles per hour, how long did the man’s return trip take?
সমাধান
সঠিক উত্তর: Option A
A man rowed 3 miles upstream in 90 minutes Let r represent the rowing r D = rt OR r = D/t (r-2) = 3/1.5 = 2 r-2 = 2 r = 4mi/hr With the current, will travel 6mi/hr {{{ 3mi/6(mi/hr) = .5hr}}} or 30min
