1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ivolga24 [154]
3 years ago
11

Traveling with the wind, Jerry takes 10 minutes to bicycle to a local library 2.5 km away. Coming back against the wind, it take

s him 15 minutes. What is Jerry's bicycling speed in still air?
Mathematics
1 answer:
olganol [36]3 years ago
7 0

7.5 km/h

Step-by-step explanation:

Let's assign the speed of Jerry in still air as <em>x </em> (in km/h)

Let's assign the speed of the wind as <em>y </em>(in km/h)

With the wind as Jerry’s back, he takes 10 minutes to get to the library. We can create the following equation. (<em>we are converting the minutes to hours by dividing by 60</em>);

2.5 / (x + y) = 10/60

10x + 10y = 150

x + y = 15

With the wind against Jerry, he takes 15 minutes from the library. We can create the following equation;

2.5 / (x-y) = 15/60

15x – 15y = 150

x – y = 10

We can now solve the simultaneous equation by subtraction;

x + y = 15

x – y = 10

2y = 5

y = 5/2 = 2.5

y = 2.5 km/h

x = 7.5 km/h

Learn More:

brainly.com/question/8046928

#LearnWithBrainly

You might be interested in
If line segment AB measures approximately 8.6 units and is considered the base of parallelogram ABCD, what is the approximate co
liraira [26]

Answer:

about 4.8 units

Step-by-step explanation:

6 0
2 years ago
Please help on this i cant understand it
poizon [28]

Answer:

to get the probability you add the number of figure all together

divide the number of spheres with the total

ie

2 ÷ 10

you get 1÷ 5

you get the answer as 0.2

5 0
2 years ago
The diameter of a circle is 6 centimeters. What is the circle's area?<br><br> Use 3.14 for pi
Lynna [10]

Step-by-step explanation:

diameter=

2 \times\pi \times r = 6 \\ r =  \frac{6}{2 \times 3.14}  = 0.955 \\ area = \pi \times  {r}^{2}  = 3.14 \times  {0.955}^{2}  \\  =  2.87\:  {cm}^{2}

7 0
3 years ago
Read 2 more answers
5. If the tree's circumference is 141.3ft, what is its diameter?
BigorU [14]

Answer:

d ≈ 45 ft

General Formulas and Concepts:

<u>Symbols</u>

  • π (pi) ≈ 3.14

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right  

Equality Properties

  • Multiplication Property of Equality
  • Division Property of Equality
  • Addition Property of Equality
  • Subtraction Property of Equality<u> </u>

<u>Geometry</u>

  • Circumference of a Circle Formula: C = πd

Step-by-step explanation:

<u>Step 1: Define</u>

Circumference <em>C </em>= 141.3 ft

<u>Step 2: Solve for </u><em><u>d</u></em>

  1. Substitute in <em>C</em> [Circumference Formula]:                                                       141.3 ft = πd
  2. Substitute in π (approximation):                                                                      141.3 ft ≈ 3.14d
  3. [Division Property of Equality] Divide both sides by 3.14:                              45 ft ≈ d
  4. Rewrite:                                                                                                             d ≈ 45 ft
7 0
3 years ago
Read 2 more answers
Britney work 35 hours at a rate of pay of 9.55 how much did she earn before taxes ​
k0ka [10]

Answer:

3.66

Step-by-step explanation:

35÷9.55=3.66

7 0
3 years ago
Other questions:
  • Bob ordered 17 yards of lumber to build a treehouse how many inches of lumber did he order
    12·1 answer
  • .<br> Use the Distributive Property to simplify the expression.<br><br> 3 × 72
    7·1 answer
  • Which one of the following does not find the value of f ′(5) for f(x) = 3x2 – 2x – 4?
    11·1 answer
  • Write this number, 0 ones, 6 hundredths, 5 tens, 5 hundreds, 5 tenths
    9·2 answers
  • Simplify the expression. Write your answer as a power.<br><br> (−5/7)^8⋅(−5/7)^9
    9·1 answer
  • Express 6^1/4 b^3/4 c^1/4 using a radical
    5·1 answer
  • 7. Our solutions are the
    8·1 answer
  • A 9 year old boy has $12 saved.
    14·1 answer
  • What is the LCD of 7/8 and 3/4?
    14·2 answers
  • Write the equation of the line in slope intercept form. the coefficients in the equation are b=4, and m=-5.
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!