Let the speed of boat in still water be x km/hr and that of stream be y km/hr. ATQ, ⇒ (x + y) – (x – y) = 8 ⇒ y = 4 km/hr ⇒ x = 4 × 11/4 = 11 km/hr Required time = [60/(11+4)] + [42/(11−4)] = 10 hr
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