Anthony drives 15 km at 40 kph and return at the rate of 60kph , what is the average rate for the entire round trip​

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Answer:

  48 kph

Step-by-step explanation:

The distance is immaterial, as long as it is the same at both speeds. The total time for some distance d is ...

  t = d/40 +d/60

And the average speed is ...

  2d/t = 2d/(d(1/40 +1/60) = 2/(1/40 +1/60) = 2(40)(60)/(40+60) = 4800/100 = 48

The average rate for the round trip is 48 kph.

_____

Additional comment

This value is called the harmonic mean of the two speeds. It is the reciprocal of the average of the reciprocals of the speeds.

somebody help me please

FSelect the correct answer. Consider these functions: f(x)=4x^3-10 g(x)=3x-4/2 What is the value of g(f(2))? A. -6 B. 2 C. 19 D. 31

Bobby and Marie are running a lemonade stand.They spend $12 on all their materials and charge $1.50 for each cup of lemonade. If they sell 20 cups of lemonade, how much money would they make(or lose)?

bag contains 6 red marbles and 12 yellow marbles. If a representative sample contains 3 red ​marbles, then how many marbles would you expect it to​ contain? Explain.

Find a perimeter of a pool

Which of the following is a square root of 3(cos(4pi/9)+i sin(4pi/9))

Which inequality is true?
A.195 > 14.1
B.205 < 14.1
C.208 14.1
D.218 - 14.1

e) Let f(x) = -2x + 5. Find and simplify the expression for the difference quotient,
F(x+h-f(x)/h

PLEASE HELP!
NO LINKS!
I only need help on letter d!!

What is the percent of change from 78 to 100

im sorry, i need help, can someone explain it?

If you think of the equation as an equation for a line.

=+
y
=
m
x
+
b

where

=5/9(−32)
C
=
5
/
9
(
F
−
32
)

or

=5/9−5/9(32)
C
=
5
/
9
F
−
5
/
9
(
32
)

you can see the slope of the graph is 5/9
5
/
9
, which means that for an increase of 1 degree Fahrenheit, the increase is 5/9
5
/
9
of 1 degree Celsius. Therefore, statement I is true.

This is the equivalent to saying that an increase of 1 degree Celsius is equal to an increase of 9/5
9
/
5
degrees Fahrenheit. Since 95
9
5
= 1.8, statement II is true.

On the other hand, statement III is not true, since a temperature increase of 9/5
9
/
5
degrees Fahrenheit, not 5/9
5
/
9
degree Fahrenheit, is equal to a temperature increase of 1 degree Celsius.

The final answer is D.

please help EVERYONE

Is this a function?

A) Yes
B) No

Quando Rondo is a dead man walking

Estimate the perimeter of the figure to the nearest whole number.

A farmer plants the same amount every day, adding up to 212 acres at the end of the year. If the year is 23 over, how many acres has the farmer planted?

At schools art teacher designs a circular flower bed inside a rectangular sandbox. The sandbox is 6 feet wide and 10 feet long. How many square feet of sand will there be after the flower bed is installed? Use 3.14 for pi. Round that answer to the nearest square foot.

Please help I’m so confused right now!!!

Find the volume of the irregular
figure.
1 cm
2 cm
? ]cm3
8 cm
1 cm
3 cm
3 cm
5 cm
What is the answer to the question

Chyanee's meal cost $30.25 and Tango's meal cost $25.75. Chyanee treats Yanci by playing for both meals and leaves a 10% tip. Explain in writing (typing) how to find the amount both meals cost,the amount of the tip and the total amount of money Chyanee spent.(Remember to write 5 or more complete sentences.)​

Get 20 points.The square root of 144 is 12, because12 x 12 = 144. The square root of 169 is 13, because
13 x 13 = 169. Which expression will give the closest approximation to the square root of 156?

Jarvis a 41-year old male, bought a $115,000, 20yr life insurance policy thru his employer. Jarvis is paid weekly. How much is deducted from each of his paychecks for life insurance?

Find the measures of the angles.

Please if you can, explain.​

State the most specific name for each figure

Can u answer this? respond please

Alyssa's mother was sick. Alyssa, went to the store and bought 2/10 pound of medicine, then another 1/10 of medicine. What would the answer be when you add them together? Denominator stays the same.

Can someone please answer quick.

what is the missing blank?

A swim instructor would like to test the effect of a new swim technique versus the standard technique for a group of 25 competitive swimmers.

The swim instructor divides the students by class (junior or senior), and then randomly allocates half of the 14 juniors and 5 of the 11 seniors to receive instruction on the new technique.

During swim practice, the instructor times the juniors as they race against each other to see if those who learned the new technique outperform their peers. The instructor does the same for the seniors.

At the end of practice, the instructor compares the average swim time for both juniors and seniors among those who did and did not use the new technique.

A) The instructor should place the 25 student names on slips of paper and place them in a hat. Twelve of the slips should be drawn out and those students should receive the instruction on the new technique.

B) The instructor should place the names of the 14 juniors on slips of paper and place them in one hat. The 11 seniors’ names should be placed on slips of paper and placed into a separate hat. The instructor should randomly select 7 juniors and 5 seniors to receive instruction on the new technique.

C) For each student, the instructor should flip a coin. If the coin lands on heads, the student will receive instruction on the new technique. If the coin lands on tails, the student will not receive instruction on the new technique.

D) The students should line up alphabetically and count off by 2s. Every student who gets a 1 will receive instruction on the new technique. Every student who gets a 2 will not receive instruction on the new technique.

Mike went to a football game with his family. They bought 5 boxes of popcorn and 3 programs, and spent $41. Sean's family went to the same game, bought 3 boxes of popcorn and 2 programs, and spent $26. How much does each program cost at the game?