stream goes down and covers the same distance upstream in 5 hours if the speed of the stream is 2km /hour .find the speed of stream in still water
Answers
Answered by
7
Step-by-step explanation:
Let the distance between the two ports be x km.
Then, speed downstream = x/4
And speed upstream = x/5
Speed of the stream,
= [speed downstream - speed upstream] / 2
= (x/4 - x/5)/2
Or, (5x -4x)/40 = 2
Or, x/40 = 2
Thus, x = 80 km.
Distance between two ports = 80 km.
Answered by
23
Answer:
Speed of stream = 2 km/hr
let speed of boat (in still water) = x km/hr
while going downstream his speed = x+2 km/hr
and going upstream = x-2 km/hr
now A/Q
dis /x+2 = 7⇒ dis = 7 (x+2) ......(1)
and dis / x-2 = 8 ⇒ dis = 8(x-2) ............(2)
(1) = (2)
7x + 14= 8x - 16 ⇒ x = 30 km/hr
and dis = 7(30+2) = 7 x 32 = 224 km
hope this helps....
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