Motion in a Plane - Result Question 53

56. 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

[2000, 1998]

(a) 3

(b) 4

(c) 21

(d) 1

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Answer:

Correct Answer: 56. (a)

Solution:

  1. (a)

Speed along the shortest path

=115/60=4km/hr

Speed of river v=5242=3km/hr



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