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The speed of a motor-boat is that of the current of water as 36 : 5 The boat goes along with the current in 5 hours 10 minutes. It will come back in ?
5 hrs 50 min
6 hrs
6 hrs 50 min
12 hrs 10 min
Since the ratio is given 36 : 5 Let the speed of boat in still water = 36 km/h. and the speed of the stream = 5 km/h Downstream speed = 41 km/h Upstream speed = 31 km/h Distance = Downstream speed × Downstream time = (41 × 31/6) km. Upstream time = Distance/ Upstream = [41 × (31/6)]/31 = (41 × 31)/6 × 3 = 41/6 = 6 hrs. 50 min.
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