Answer: Answer is D, if I'm not mistaking
Step-by-step explanation:
sorry if im wrong.
Solution
Let take boat speed = x
Current speed = 4
Upstream = x - 4
Downstream = x + 4
Distance = 9
Time upstream + Time downstream = 10
Time = Distance/Speed
9/(x + 4) + 9/(x - 4) = 10
Solving this equation 9(x-4)+9(x+4) = 10(x^2 -16)
9x - 36 + 9x + 36 = 10x^2 - 160
18x = 10x^2 -160
10x^2 -18x - 160 = 0
Now solving the above quadratic equation, we get
x = 5 or x = -16/5
We ignore the negative value.
The answer is 5.
The speed of the boat in still water is 5mph.
Thank you.
Answer:
distance between point A and point B is 10 units
Step-by-step explanation:
looked it up
Answer:
n>-15 or c
Step-by-step explanation:
Answer:
946.10 gallons per week
Step-by-step explanation:
1 cm = 0.393701 inch
Width = 5.0m = 196.85 inch
Length = 12.0 m = 472.44 inch
The volume evaporated weekly is given by:
Converting to gallons:
946.10 gallons of water must be added to the pool each week.