BOATS AND STREAMS SOLUTIONS & SOLVED QUESTIONS

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BOATS AND STREAMS SOLUTIONS

Important facts:
1) In water, the direction along the stream is called a downstream.
2) In water, the direction against the stream is called an upstream.
3) If the speed of the boat in still water is U km/hr and the speed of the stream is V km/hr then,
Speed downstream =U + V km/hr
Speed upstream = U - V km/hr
4) If the speed of the boat downstream is A km/hr and the speed of the boat upstream is B km/hr then,
Speed of the boat in still water = 1/2(A+B) km/hr
Speed of the stream =1/2(A-B) km/hr
Let us understand this concept with the help of some examples:
Eg: If a man can swim downstream at the speed of 6kmph and upstream at 2kmph his speed in still water is:
Solution: Speed downstream x = 6 kmph
Speed upstream y = 2kmph
So, Speed in still water = ½ (x+y) kmph
= ½ (6+2)
= 8/2 = 4kmph
So, speed in still water = 4kmph
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