1. Tardigrade
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  3. Physics
  4. A boat which has a speed of 5 km/hr in still water crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the river water in km/hr is:

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Q. A boat which has a speed of $5\, km/hr$ in still water crosses a river of width $1\, km$ along the shortest possible path in $15$ minutes. The velocity of the river water in km/hr is:

Motion in a Plane

Solution:

image
Velocity of the river is along $AO$ By applying triangle law of vector addition, value of $AB$ comes to be $3\,$ km/hr.