Two boats X and Y start towards each other from two places, 198 km apart. Speed of the boat X and Y in still water are 15 km/hr and 18 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, ⇒ (15 + x) t + (18 – x) t = 198 ⇒ 15t + 18t = 198 ⇒ 33t = 198 ⇒ t = 198/33 = 6 hours
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