After declaration of Sadiya Dhubri stretch in Brahmaputra river as a National Waterway Assam Tourism...........

Quantitative Aptitude(Banking) Boats and Streams

After declaration of Sadiya-Dhubri stretch in Brahmaputra river as a National Waterway, Assam Tourism Department decides to do a survey of landscape surrounding the stretch of the river. A boat of Assam Tourism Department has a speed of 5 km/hr in still water; crosses Brahmaputra river of width 30 km in Sadiya-Dhubri stretch along the shortest possible path in 15 hours. The speed of the river is?

3 km/hr

4 km/hr

2 km/hr

6 km/hr

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Explanation:

Speed of the boat in river of width 30 km in Sadiya-Dhubri stretch = Distance/Time Taken = 30/15 = 2 km/hr
Speed of the boat in still water is = 5 km/hr
As the river Brahmaputra's water is opposing the boat, speed of the river = 5-2 = 3 km/hr