Respuesta :
84 divided by 4 =21 , 21x28=588 , so 588 is the speed of the current
The speed of boat in still water is 12 mph and speed of current, is 9 mph.
What is downstream?
The word downstream (which is one word instead of being two words; down stream) mainly means the direction that the water in a river flows
Given:
Total time= 24 hours
Let x be the speed of the boat in still water.
Let y be the speed of the current.
The boat travelled 84 miles downstream.
let the total speed would be (x + y) mph.
Distance = speed × time
84 = 4(x + y)
21 = x + y.....................( 1)
The trip back took 28 hours.
Now, let the total speed would be (x - y) mph.
84= 28(x - y)
3 = x - y.............(2)
Solving (1) and (2)
24 = 2x
x = 24/2
x = 12 mph
and, 21 = 12 + y
y = 21 - 12
y = 9 mph
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