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
Andreas93 [3]
2 years ago
14

One morning, John drive 5 hours before stopping to eat. After lunch, he. increased his speed by 10 mph. If he completed a 500-mi

le trip in 10 hours of driving time, how fast did he drive in the morning?
Mathematics
1 answer:
Marrrta [24]2 years ago
6 0
So  he drove 5hrs, before lunch, now, he was going at speed, say "r", after he ate, he sped up by 10mph, so, his rate is whatever "r" is, plus 10, or " r + 10 ", after lunch

we know the whole trip took 10hrs, so, is 5hrs before lunch and 5hrs after lunch

we also know the whole trip was 500miles, so if he drove, say "d" miles before lunch, after lunch he drove the slack after lunch, or " 200 - d "

recall, your d = rt, distance = rate * time

\bf \begin{array}{lccclll}
&distance&rate&time\\
&-----&-----&-----\\
\textit{before lunch}&d&r&5\\
\textit{after lunch}&500-d&r+10&5
\end{array}
\\\\\\

\begin{cases}
\boxed{d}=5r\\
500-d=(r+10)5\\
----------\\
500-\boxed{5r}=(r+10)5
\end{cases}
\\\\\\
\cfrac{500-5r}{5}=r+10\implies 100-r=r+10

and I'm sure you know what that is
You might be interested in
If the price of an item before tax is $500.00 and the tax percentage is 10%, what is the selling price
g100num [7]

Answer:

$550.00

Step-by-step explanation:

An item before tax costs $500.00

The tax percentage is 10%

So $500.00 * 10% = 50.00 dollars will be payed in taxes.

And the selling price will be $50.00 + $500.00 = $550.00

8 0
2 years ago
Name all the word(s) that can be used in place of classify
ikadub [295]

the answer would be A rank

5 0
2 years ago
Read 2 more answers
3. A multiple choice test contains 15 questions. Each question has four options, only one of
Mice21 [21]

Answer:

\frac{5005\times 3^6}{4^{15}}

Step-by-step explanation:

by using binomial property, we get the probability

P=C^{15}_{9}\times \frac{1}{4^9}\times \frac{3^6}{4^6}

3 0
3 years ago
Find the square. (3m + 3)2
olya-2409 [2.1K]

Answer:

9m^2 + 18m + 9

Step-by-step explanation:

(3m + 3)2

Square ;

(a + b)^2 = a2 + b2  + 2ab

(3m + 3)2

= (3m)^2 + (3)^2 + 2 (3m)(3)

= 9m^2 + 9 + 18m

= 9m^2 + 18m + 9

5 0
2 years ago
What is the Simplify expression of (15+39)÷6
Usimov [2.4K]

Answer:

9

Step-by-step explanation:

\frac{(15 + 39)}{6}  \\  \frac{54}{6 }  \\ ans = 9 \\

4 0
3 years ago
Read 2 more answers
Other questions:
  • Tom can paint twice as fast as Mark. If they complete a job in 4 hours, how long would it have taken Tom working alone?
    6·1 answer
  • Timmy and Pedro have 24 trading cards altogether. Timmy gives Pedro 5 they each have the cards, and same number of cards. at fir
    15·1 answer
  • 6.
    13·1 answer
  • a box of laundry detergent is on sale for $6.50 if this price represses a 40% discount from the original price what is the origi
    13·1 answer
  • Shortly after creating a car washing business, you made $65 washing ten
    8·1 answer
  • Which point is best represented by the ordered pair (2, -5.5)?
    15·2 answers
  • .−3(4x + 3) + 4(6x + 1) = 43<br> What is the solution?
    11·1 answer
  • Solve and make a table ( you may decide what the topic is and the value is.Algebra I)
    8·1 answer
  • A class has 28 students 13 boys and 15 girls what is rstio girls to boys
    14·1 answer
  • The data to the right represent the cost of living for 20 states. The cost of living is a measure of the average price paid for​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!