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
Nady [450]
3 years ago
13

A skateboarder went a kilometer in 3 minutes with the wind, and returned in four minutes against the wind.

Mathematics
1 answer:
inn [45]3 years ago
8 0

Step-by-step answer:

Answer to problems of this kind is the reciprocal of the harmonic mean of the time required.

We need to find the average of the speeds, not the average of the time.

The respective speeds are 1/3 and 1/4.

The average of the speeds is therefore (1/3+1/4)/2 = 7/24  (harmonic mean of the time taken).

The time required is therefore the reciprocal of the unit speed,

T = 1/(7/24) = 24/7 = 3 3/7 minutes, or approximately 3.43 minutes.

You might be interested in
21+[36devided(12-6)+2-5]multiply3
Alona [7]
12-6=6
6+2=8-5=3
21+3x3=72
4 0
3 years ago
Read 2 more answers
If -5x-y=1 is a true equation, what would be the value of 5(-5x-y)?
Tanzania [10]

Answer:

-25-5x-5y

Step-by-step explanation:

7 0
3 years ago
What is 4 x 4 x 4 x 4 x 4 x 4 in exponential notation?
Norma-Jean [14]

Answer:

4^{6}  

4096

Step-by-step explanation:

i tried

6 0
2 years ago
Read 2 more answers
Evaluate the expression for<br> x = 6, y = -10:<br> 3x - 7y
Natasha_Volkova [10]

Answer:

88

Step-by-step explanation:

hello,

we need to replace x by 6 and y by -10 so it comes

3*(6)-7*(-10)

= 18 + 70 = 88

hope this helps

8 0
3 years ago
Read 2 more answers
The hyperbola's____ is the point halfway between its two vertices
Anika [276]
<span>this is the answer = "center center"    I hope this help.. </span>
4 0
3 years ago
Read 2 more answers
Other questions:
  • PLS HELP I WILL GIVE BRAINLIEST AND 40 POINTS
    13·1 answer
  • Solving Inequalities<br><br>Algebra 1​
    8·2 answers
  • A machine is used to fill Apple Juice bottles with juice. The machine has a known standard deviation of σ = 0.05 liters. The tar
    6·1 answer
  • Working alone, it takes Julia 16 hours to clean an attic. Lea can clean the same attic in 15 hours. If they worked together how
    14·1 answer
  • Abdul ordered some books online and spent a total of $133. Each book cost $8 and he paid a total of $5 for shipping. How many bo
    9·2 answers
  • PLEASE HELP WILL MARK AND 5 STARS I BEG OF U
    8·2 answers
  • Jill filed her taxes and found out that she owes an additional $1,500. Unfortunately, she can’t afford to pay that amount immedi
    12·1 answer
  • There are two mystery numbers the sum of eight times the first number and 10 times the second number is 24. The sum of seven tim
    8·1 answer
  • Sixth grade math please in K12
    6·1 answer
  • Can someone help me I need this done ASAP like TODAY… I know D. I just dont know A, B, C. Please helppppppppp meeeeeeeeee
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!