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
Anuta_ua [19.1K]
3 years ago
9

On a certain trip, a motorist drove 6 miles at 20mph, 6 miles at 30mph, and 6 miles at 40mph. What portion of the total driving

time did she spend driving 30mph?
Mathematics
1 answer:
NikAS [45]3 years ago
7 0

Answer:

  4/13

Step-by-step explanation:

Driving time is ...

  time = distance/speed

Then the ratio of times is ...

  6/20 : 6/30 : 6/40

  = 3/10 : 1/5 : 3/20

If we multiply by 20, we can get integer ratios:

  = 6 : 4 : 3

The middle ratio number represents the time spent at 30 mph, and the total of all ratio numbers represents the total driving time. Then the fraction spent at 30 mph is ...

  4/(6+4+3) = 4/13

_____

Total driving time was 13/20 hours, or 39 minutes. Of that time, 12 minutes was spent driving at 30 mph.

You might be interested in
Choose any positive integer. Powers of two here are not very interesting, so choose something else. If the number you have chose
Yakvenalex [24]

Answer:

Step-by-step explanation:

Let the integer be 6 for even and 7 for odd (say)

For 6, we divide by 2, now get 3.  Now we multiply by 3 and add 1 to get 10. Now since 10 is even divide by 5, now multiply by 3 and add 1 to get 16.  Now divide by 2 again by 2 again by 2 again by 2 till we get rid of even numbers.

The result is 1, so multiply by 3 and add 1 we get 4 now divide 2 times by 2 to get 1, thus this result now again repeats after 2 times.

Say if we select off number 3, multiply by 3 and add 1 to get 10 now divide by 5, now repeat the same process as above for 5 until we get 1 and it gets repeated every third time.

Thus whether odd or even after some processes, we get 1 and the process again and again returns to 1.

5 0
3 years ago
HELP WITH 12 PLZ???!?!?!?!!!!?
dezoksy [38]

Can you show the full question?

3 0
3 years ago
Read 2 more answers
Factorise 2x^2 - 9x -5
Nostrana [21]

Answer:

(x-5)(2x+1)

Step-by-step explanation:

Its called google XD

5 0
3 years ago
Based on the results from part C, which two statements correctly interpret actions the business should take?
icang [17]

Answer:

.

Step-by-step explanation:

7 0
2 years ago
Can you help thanks ​
Arte-miy333 [17]

Answer:

the answer is inverse operations

7 0
2 years ago
Other questions:
  • Please answer this correctly
    10·1 answer
  • How many pints are equivalent to 3 gallons?
    6·2 answers
  • Can someone help me in stuck thank you (picture attached)
    7·1 answer
  • A car travels at a speed of 25 miles per hour. the distance it travels in h hours given by the equation d(h)=25h.
    6·1 answer
  • Solve kx + 8 = 4 for x.
    8·1 answer
  • HELP PLZZZS!!!!!!! EASY 10 points *easy*
    14·2 answers
  • WILL GIVE BRAINLIEST IF RIGHT
    6·2 answers
  • (If A(2, -3), B(3,-2) and point C divides the line segment AB in the ratio of 1: 2, find OC.)​
    6·1 answer
  • Need some help with the question in the image <br><br>cheers​
    13·1 answer
  • Consider a function that goes through the two points (0, 5) and (1, 20). Find the formula for the function if(a) the function is
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!