Question

The distance travelled by a boat downstream is 112112  times the distance travelled by it upstream in the same time. If the speed of the stream is

3 kmph, find the speed of the boat in still water.
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Answer 1

Step-by-step explanation:

Formulas and Quick Tricks for Boats and Streams

Upstream: In water, the direction against the stream is called upstream.

Downstream: In water, the direction along the stream is called downstream.

Let the speed of a boat in still water be u km/hr and the speed of the stream be v km/hr, then:

Speed downstream = (u + v) km/hr

Speed upstream = (u - v) km/hr.

Let the speed downstream be a km/hr and the speed upstream be b km/hr, then:

Speed in still water =1/2(a+b) km/hr

Rate of stream = 1/2(a−b) km/hr

A man can row a boat in still water at x km/hr in a stream flowing at y km/hr. If it takes him t hours to row a place and come back, then the distance between the two places = t(x2−y2) / 2x km

A man takes n times as long to row upstream as to row downstream the river. If the speed of the man is x km/hr and the speed of the stream is y km/hr, then x = y(n+1) / (n−1)