Two boats X and Y start towards each other from two places, 119 km apart. Speed of the boat X and Y in still water are 7 km/hr and 10 km/hr respectively. If X proceeds down and Y up the stream, they will meet after.
Let the speed of the stream be x km/hr and both the boats meet after t hours According to the question, ⇒ (7 + x) t + (10 – x) t = 119 ⇒ 7t + 10t = 119 ⇒ 17t = 119 ⇒ t = 119/17 = 7 hours
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