**In a stream running at 3 km/h, a motorboat goes 12 km upstream and back to the starting point in 60 minutes. Find the speed of the motorboat in still water. (in km/h)** A) $$ 2(2 \\sqrt{17}) $$ B) $$ 2(4 \\sqrt{15}) $$ C) $$ 3(2 \\sqrt{17}) $$ D) $$ 3(4 \\sqrt{17}) $$ Click Link for Answer