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Start learning 50% faster. Sign in nowATQ: Let the upstream and downstream speed of the boat be '3x' km/hr and '5x' km/hr, respectively. ATQ, 5x = (75/2.5) So, 'x' = 6 So, upstream speed of the boat = 3x = 3 × 6 = 18 km/hr Required distance = 18 × 10 = 180 km
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