The speed of a boat in still water is 12 km per hour. Going downstream it moves at the rate of 19 km per hour. The speed of the boat against the stream is?

5 km/hr
3 km/hr
8 km/hr
Data inadequate

Correct Answer: 5 km/hr

Explanation:

Speed of stream = speed in downstream - Speed in still water
⇒ Speed of stream = 19 - 12 = 7 km/hr
Speed of boat against stream = Speed in still water - Speed of stream.
⇒ Speed of boat against stream = 12 - 7 = 5 km/hr

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