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:

Question

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: (A) 1 (B) 3 (C) 4 (D) √41

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/93a57c01284ede81b21949b5986f9373-.png" /> Velocity of the river is along AO By applying triangle law of vector addition, value of AB comes to be 3 km/hr.

Q. A boat which has a speed of $5 km / h r$ 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:

$1$

$3$

$4$

$41$

Velocity of the river is along $A O$ By applying triangle law of vector addition, value of $A B$ comes to be $3$ km/hr.

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

1

3

4

41​

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

Q. A boat which has a speed of $5 km / h r$ 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:

$1$

$3$

$4$

$41$

Velocity of the river is along $A O$ By applying triangle law of vector addition, value of $A B$ comes to be $3$ km/hr.