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
Gennadij [26K]
3 years ago
12

Janet can do a job in 3 hours, and Garry can do the same job in 2 hours. If Janet works for 1 hour before Garry comes to help, h

ow long will it take them to do it together.
Mathematics
2 answers:
lidiya [134]3 years ago
8 0

Answer:

48 minutes

Step-by-step explanation:

Given that:

Time taken by Janet = 3 hours

Janet's rate = 1/3 job / hour

Time taken by Garry = 2 hours

Garry's rate = 1/2

Rate of working together :

1/3 + 1/2 = (2 + 3) /6 = 5/6 job/hour

If Janet works for one hour before Garry joins ;

1/3 of the job has been done by Janet

1 - 1/3 = 2/3 of the job left

Hence to finish the job together, it will take :

Fraction of JOB left ÷ rate of working together

(2/3 ÷ 5/6)

= 2 /3 * 6/5

= 12 / 15

= 4 / 5 hours

To minutes

(4/5) * 60

= 240/5

= 48 minutes

Liono4ka [1.6K]3 years ago
5 0

Answer:

1 4/5

Step-by-step explanation:

You might be interested in
How are the properties of reflection used to<br> transform a figure?
Lunna [17]

Answer:When you reflect a point across the y-axis, the y-coordinate remains the same, but the x-coordinate is transformed into its opposite (its sign is changed). ... Remember that each point of a reflected image is the same distance from the line of reflection as the corresponding point of the original figure.

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Write down the two irrational number​
love history [14]

Answer:

Square root of 2

Pi

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
How do you know when a question is a division problem
Aleksandr [31]
If the problem says by or divided by
5 0
3 years ago
Read 2 more answers
In 2000, the population of a county was 25,300,987. The population decreased at a rate of 2% each year. What was the population
EastWind [94]

Answer: In 2008 the population was 21,525,144

Step-by-step explanation:

You need to use the following formula for Exponential decay:

P=P_0(1-r)^t

Where P_0 is the initial population in the year 0, r is the rate of decay and t is the time.

In this case, you can identify that:

P_0=25,300,987\\\\r=2\%\\\\t=8

Therefore, substituting these values into the formula for Exponential decay, you get:

P=P_0(1-r)^t\\\\P=(25,300,987)(1-\frac{2}{100})^8\\\\P=21,525,144

Then, in 2008 the population was 21,525,144

6 0
3 years ago
I. GIVEN TRIANGLE POR, DETERMINE THE FOLLOWING. <br><br>please help me out with this ​
Digiron [165]

34

Step-by-step explanation:

 122

7 0
2 years ago
Read 2 more answers
Other questions:
  • Solve for t.<br><br><br> −5t≥70<br><br> Help Please
    8·2 answers
  • Please help! Will give brainliest!
    10·1 answer
  • How many repeating digits are in 41/11
    8·2 answers
  • How many possible outcomes are there for this event?
    7·1 answer
  • Help me please me find what X =
    8·1 answer
  • there are 678 freshmen ,and 552 sophomore students. how many more freshmen than sophomore students are there?​
    15·2 answers
  • Choose the situation in which the use of approximate numbers is most appropriate.
    11·1 answer
  • Which expression is undefined ?
    9·1 answer
  • What is the area of the triangle?
    13·1 answer
  • Graph this line using the slope and y-intercept: y = 1/9x + 4​
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!