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Let the speed of boat in still water be ‘x’ km/h
Speed of stream = 0.30 × x = ‘0.3x’ km/h
Speed of boat in upstream = x – 0.3x = 0.7x km/h
So, 0.7x = 84/2
Or, 0.7x = 42
Or, x = 60
So, speed of boat in still water = 60 km/h
And, speed of stream = 60 × 0.3 = 18 km/h
Time required to cover 156 km in downstream = {156/(18 + 60)} = 2 hours
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