The speed of a boat in still water is 10 km/hr. If it can travel 26 km downstream and 14 km upstream in the same time, the speed of the stream is :

The speed of a boat in still water is 10 km/hr. If it can travel 26 km downstream and 14 km upstream in the same time, the speed of the stream is : Correct Answer 3 km/hr

Hints: ধরি, stream এর speed x km/hr এখন, উভয়ক্ষেত্রে একই সময় লাগে, সময় = দূরুত্ব /বেগ 26 /(10 + x) = 14/(10 - x) 260 - 26x = 140 + 14x 40x = 120 x = 3 km/hr
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