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?
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
