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zlopas [31]
2 years ago
15

a boat is going 144 miles upstream on a river. the speed of the boat in still water is 60 miles per hour. the speed of the river

current is 80% less than the speed of the boat in still water. how long does the journey take?( in hours)
Mathematics
1 answer:
Katena32 [7]2 years ago
5 0

Answer:

Let  b  =  rate of the boat.

Let  r  =  rate of the river.

The rate going downstream is  b + r.

The rate going upstream is  b - r.

rate x time  =  distance

4(b + r)  =  144     --->     b + r  =  36     [divide both sides by 4]

9(b - r)  =  144      --->     b - r  =  16      [divide both sides by 9]

Add town:                          2b  =  52  

Divide by :                           b  =  26  mi/hr

                                           r  =  10  mi/hr

Step-by-step explanation:

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kakasveta [241]
Hello there!

Number 1 is C (11, 4) Image is below

I don't know number 2, so so sorry!


Number 3 is A. 36 The formula for perimeter of a rectangle is (2 * base) + (2 * height)
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Number 4 is 23 units. 


I hope I was of assistance!

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