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blondinia [14]
2 years ago
15

A man can row at 9km/h in still water. He rows 1.5km upstream and back again. The stream flows at 3km/h. What is his average spe

ed for the whole trip?
Mathematics
2 answers:
MrRa [10]2 years ago
8 0

Answer: average speed is 8 km/h

Step-by-step explanation: in upstream his speed is 9 km/h -3km/h.

So his speed is 6km/h and he needs time t= s/v= 1.5 km: 6 km/h = 0.25 h

Downstream his speed is 9 km/ + 3km/h = 12km/h and time is

1.5 km:12km/h= 1/8 hours= 0.125 h

Average speed v = s/t = 3km: (0.25 + 0.125 ) h = 8 km/h

ELEN [110]2 years ago
4 0

Answer:

Step-by-step explanation:

Rowing against the current, he travels 9-3 = 6 km/h.

1.5 km × (1 h)/(6 km) = ¼ h

It takes him ¼ h to row 1.5 km upstream.

Rowing with the current, he travels 9+3 = 12 km/h.

1.5 km × (1 h)/(12 km) = ⅛ h

It takes him ⅛ h to row 1.5 km downstream.

Average speed = (3 km)/(¼+⅛ h) = 8 km/h

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solniwko [45]

Answer:

y=16x

Step-by-step explanation:

So, you are given the equation as if y=total distance the earth travels in x minutes. If you are given that you travel 80 miles in 5 minutes, you can plug  these value into the variables they are representing and solve for the constant.

Visual:

y=xk          y=miles        x=minutes         k=constant

Plug in your values and you get:

80=5k

Now, you solve for k by diving 5 on both sides, which leaves you with k=16.

Now you plug your value for k into the original equation, leaving you with y=16x

6 0
3 years ago
Find the area and perimeter of a rectangle with a length of 3x + 2 and a width of 4x + 3.
bekas [8.4K]

<em>Answer:</em>

170ft^2

The area is 170ft^2.

4 0
2 years ago
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Line g passes through points (1, 1) and (10,9). Line h is perpendicular to g. What is the
shusha [124]

Answer:

-9/8

Step-by-step explanation:

Slope m = (y2-y1)/(x2-x1)

using (1,1) and (10,9)

m = (9 - 1)/(10 - 1)

m = (8)/(9)

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slope of line g is 8/9

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5 0
3 years ago
(25 1/8- 20.5) solve it
Sergeeva-Olga [200]

Answer:

the answer is 4.625 or 4 6/10

Step-by-step explanation:

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Regression line :brainly.com/question/9274316

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