Boats and Streams Example 3

Example 1:
If a boat goes 7km upstream in 21km and the stream is 5 kmph, then the the speed of the boat ? 
Answer :
Rate of stream = d / t = 7 x 60 / 21 = 20 kmph.
Let speed in still water be x km / hr.
Then, speed upstream = (x - 5 ) km /hr.
So, ( x - 5 ) = ( 20 - 5 ) = 15 km /hr.



Example 2
A boat can travel with a speed of 14 km / hr in still water.if the speed of the stream is 4 km/ hr, find the time taken to go 72 km downstream.

Answer :
Speed of downstream (14 + 4 ) = 18 km/ hr
Time taken to travel 72 km downstream
= 72 / 18 = 4 hrs
So time taken to go downstream is 4 hrs.



Example 3:
A man can row upstream at 10 km /hr And downstream at 18 kmph.what is the speed of the stream ?

Answer :

Speed of stream = 1 / 2(a - b )

1 / 2 (  18 - 10 ) kmph = 4 kmph

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• Boats and Streams Example 1
• Boats and Streams Example 2
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