a motor boat whose speed is 15kmph in still water goes 30km downstream and comes back in a total of 4 hours 30 minutes. find the speed of the stream.
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Let the speed be x km/hr.
Then the downstream speed will be 15+x and upstream speed will be 15-x.
Given, 30/15+x - 30/15-x = 4 1/2
900/225-x^2 = 9/2
9x^2 = 225
x^2 = 25
x = 5km/hr.
Hope this helps!
Then the downstream speed will be 15+x and upstream speed will be 15-x.
Given, 30/15+x - 30/15-x = 4 1/2
900/225-x^2 = 9/2
9x^2 = 225
x^2 = 25
x = 5km/hr.
Hope this helps!
Answered by
0
speed of boat = 15km/hr
speed of stream = x
downstream= boat's speed + stream's speed
upstream= boat's speed - stream's speed
30×2/9 = 15 -x
x=15-20/3
x=25/3 is speed of stream
speed of stream = x
downstream= boat's speed + stream's speed
upstream= boat's speed - stream's speed
30×2/9 = 15 -x
x=15-20/3
x=25/3 is speed of stream
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