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
olga_2 [115]
3 years ago
15

I don't know how to do this or what i'm doing plz help

Mathematics
1 answer:
mote1985 [20]3 years ago
7 0

recalling that d = rt, distance = rate * time.


we know Hector is going at 12 mph, and he has already covered 18 miles, how long has he been biking already?


\bf \begin{array}{ccll} miles&hours\\ \cline{1-2} 12&1\\ 18&x \end{array}\implies \cfrac{12}{18}=\cfrac{1}{x}\implies 12x=18\implies x=\cfrac{18}{12}\implies x=\cfrac{3}{2}


so Hector has been biking for those 18 miles for 3/2 of an hour, namely and hour and a half already.

then Wanda kicks in, rolling like a lightning at 16mph.

let's say the "meet" at the same distance "d" at "t" hours after Wanda entered, so that means that Wanda has been traveling for "t" hours, but Hector has been traveling for "t + (3/2)" because he had been biking before Wanda.

the distance both have travelled is the same "d" miles, reason why they "meet", same distance.


\bf \begin{array}{lcccl} &\stackrel{miles}{distance}&\stackrel{mph}{rate}&\stackrel{hours}{time}\\ \cline{2-4}&\\ Hector&d&12&t+\frac{3}{2}\\[1em] Wanda&d&16&t \end{array}\qquad \implies \begin{cases} \boxed{d}=(12)\left( t+\frac{3}{2} \right)\\[1em] d=(16)(t) \end{cases}


\bf \stackrel{\textit{substituting \underline{d} in the 2nd equation}}{\boxed{(12)\left( t+\frac{3}{2} \right)}=16t}\implies 12t+18=16t \\\\\\ 18=4t\implies \cfrac{18}{4}=t\implies \cfrac{9}{2}=t\implies \stackrel{\textit{four and a half hours}}{4\frac{1}{2}=t}

You might be interested in
What is the volume of the composite figure? Express the answer in terms of pie.
zhenek [66]

Answer:

3127 mm3

Step-by-step explanation:

3 0
3 years ago
If the number of bacteria in a colony doubles every 25 hours and there is currently a population of 10,000 bacteria, what will t
MA_775_DIABLO [31]

Answer:

The population of 75 hours from now would be 40,000.

Step-by-step explanation:

The reason for this is because your initial number is 10,000 and when 25 hours pass by, your population would be 20,000. Another 25 hours pass by, and then your population would be 40,000. If you multiply 25 by 3, you will notice 75 hours have just passed, so your answer would be 40,000.

5 0
3 years ago
Please help I WILL GIVE BRAINLIEST !!! I need the answers right away!
natta225 [31]

Answer:

Step-by-step explanation:

6 0
3 years ago
A math teacher graded 45 problems in 3/5 of an hour. At that rate, how many problems can she grade in one hour
dolphi86 [110]

Answer:

75

Step-by-step explanation:

45*1/3=15

15*5=75

6 0
3 years ago
Read 2 more answers
The running trail in the local park is 2.826 miles long. If the park board were planning to extend the trail by 1.46 miles, what
eimsori [14]
Extend means to increase, add length to it, ADD.
       2.826
+    1.46
--------------
       4.286

5 0
3 years ago
Other questions:
  • For which values of k does have no solution "kx + y = 1" "x + ky = 1"
    11·1 answer
  • READ WHOLE QUESTION!:There are 50 campers at day camp and 10 counselors.Write the ratio campers to counselors as a fraction.Expl
    14·1 answer
  • Can you please help me I do not know the meaning of these questions
    8·2 answers
  • Simplify by combining like terms -4 + 5x - 17 - 22x
    9·1 answer
  • A gardener planted 35 strawberry plants and each of 19 rows how many strawberry plant did
    9·2 answers
  • Anyone know this? I need some help!
    5·1 answer
  • On Thursday evening Malcolm's bank balance was −£107.35.
    6·1 answer
  • You are buying a new Corvette. You must select 1 of 8 color choices, 1 of 3 trim levels, and must decide if you want power windo
    10·1 answer
  • Select all the points that are on the graph of the equation 4y−6x=12.
    6·1 answer
  • What is the measure of the indicated angle?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!