Speed of current is 25% of speed of boat in still water, if boat travelled 45 km downstream and returned back in total 12 hr. then find speed of boat in still water?
Speed of boat in still water : Speed of current = 100x : 25x => 4x : x According to question, => 45/(4x + x) + 45/(4x – x) = 12 => (135 + 225)/15x = 12 => x = 360/180 = 2 Speed of boat in still water = 4 × 2 = 8 km/hr
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