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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.

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Jobisdone [24]

\dfrac{1}{9} - \dfrac{5}{6}

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4 0
3 years ago
A TV has a listed price of $885.98 before tax. If the sales tax rate is 8.5%, find the total cost of the TV with sales tax
Butoxors [25]

Answer:

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8 0
3 years ago
Hamburger heaven is having a lunch special where customers buy one 3/4 pounds cheese burger and get one free if they set aside 1
Yuri [45]

Answer:

49

Step-by-step explanation:

49 hamburguers (of 3/4 pound)

Step-by-step explanation:

3/4 pound is equal to 0.75 pound

37 1/3 pounds of meat is equal to

37 + 1/3 pound =  37.3333 pounds

To find how much hamburguers can be made, we need to divide

37.3333 pounds/ 0.75 pounds

37.3333 pounds/ 0.75 pounds = 49.777777

(We need to round to the lowest number)

This means that 49 hamburguers could be made

Plz mark brainliest

5 0
3 years ago
The functions f, g and h are as follows:
Basile [38]

Answer:

wik2k2k2kw

Step-by-step explanation:

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4 0
3 years ago
How I divide by negative?? I forgot completely
allochka39001 [22]

Answer:

I hope this helps. If I misunderstood the question let me know

Step-by-step explanation:

1. When dividing a negative by a negative, your answer would be positive.

2. When dividing a negative by a positive, your answer will be negative.

3. When dividing a positive by a negative,your answer will be negative.

3 0
2 years ago
Read 2 more answers
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