On Friday, if ratio of the speed of boat to the speed of stream is 2:1, then what is the difference between the time taken by the boat while going upstream and downstream?
Let the speed of the boat and speed of the stream be 2x and x km/hr respectively. According to question, => [360/(2x+x)] + [360/(2x-x)] = 60 => (360/3x) + (360/x) = 60 => x = 8 The speed of stream is 8 km/hr and the speed of boat is 16 km/hr. Required difference = (360/8) - (360/24) = 30 hours
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