Let the speed of the stream be x km/hr and both the boats meet after t hours According to the question, ⇒ (12 + x) t + (15 – x) t = 189 ⇒ 12t + 15t = 189 ⇒ 27t = 189 ⇒ t = 189/27 = 7 hours
The full form of ATM is
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