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
lord [1]
3 years ago
5

A car travelled 100 km with half the distance at 40 km/h and the other half at 80 km/h. Find the average speed of the car for th

e whole journey.
Mathematics
1 answer:
Nana76 [90]3 years ago
6 0
We must look at this question in steps
The first half of the journey is travelled at 40 km/h
Half of 100km is 50 km
Using the formula
Distance = Speed x Time
Speed = Distance / Time
Time = Distance / Speed
We can work out the time:

50km / 40km/h = 1.25 hours

Next we look at the second half of the journey
50km at 80km/h
50km / 80km/h = 0.625 hours

Add together both times to work out how long the entire journey took
1.25 + 0.625 = 1.875 hours

Using the Speed formula from before
Speed = 100km / 1.875 =
53 1/3 km/h or 53.3 recurring km/h
You might be interested in
there are 24 students in a school play. the ratio of boys to girls is 5:7 how many of the students are girls
Lynna [10]

Answer:

14 girls

Step-by-step explanation:

boys : girls = total

5 : 7 = 12

10 : 14 = 24

8 0
3 years ago
All the pizzas at Tony's Pizzeria cost the same per square centimetre
8_murik_8 [283]
Click the link above
3 0
3 years ago
PLEASE HELP FAST!!!!
Nana76 [90]
For this case what we should do is use the given equation:
 F = mg sin (theta)
 And replace the following values:
 m = 0.01 kg
 g = 9.8m / s ^ 2
 theta = 22.5 degrees
 Substituting we have:
 F = (0.01) * (9.8) * sin (22.5)
 F = 0.037502976 N
 Answer:
 
The force pulling on the pendulum when it makes a 22.5 degree angle with the vertical is:
 F = 0.037502976 N
8 0
3 years ago
Blake's pool can hold 2.539 gal of water when full. If it takes 9 hours to fill the empty pool. How much water will be in the po
Dovator [93]

Answer:

0.2821 gal

Step-by-step explanation:

Since this is a direct and proportional relationship, we know that the ratio for 2.539 gal of water to 9 hours is the same as the ratio from the water in the pool after 1 hour to 1 hour. Therefore, we can simplify 2.539:9 into 0.2821111... I’m not sure what value you must round to, so I’ll assume it is to the nearest thousandth. Hence, our answer is 0.2821 gal.

I hope this helps! :)

5 0
3 years ago
What is the answer to the equation 13=1/6y + 2x
Eddi Din [679]
13=1/6y+2x
-1/6y  -1/6y
-1/6y+13=2x
         -13 -13
-1/6y=2x-13
   *-6   *-6
y=-12x-13

*I multiply it by -6 because -6 is the reciprocal of -1/6, and I can't divide -1/6, actually I can, but it just going to be more confusing that way, and the fastest way to get rid of the -1/6 when you solving this type of equation is multiply it by its reciprocal.
6 0
3 years ago
Other questions:
  • Factor the expression below.<br> x2 - 49
    7·2 answers
  • -a/2=10 what is the value of a
    10·1 answer
  • At the theater, Fred purchased x popcorns and y drinks. He spent a total of $26. The equation below describes the relationship b
    7·2 answers
  • The diagram shows a cone and its axis of rotation. If a plane passes through the axis of rotation, which type of cross section w
    8·2 answers
  • If p=(-4,3) , find: Ry=1 (P)
    9·1 answer
  • This is due today PLSS help!
    7·1 answer
  • Help. ill give brainliest
    14·2 answers
  • PLEASE HELP IT'S DUE SOON
    10·2 answers
  • Can someone help? I honestly forgot how to do this..
    15·2 answers
  • If a slice of pizza is 2 dollars and I have 15 dollars how many pieces of pizza can I get
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!