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hjlf
3 years ago
15

It takes a new mail carrier 4 hours to deliver the mail on route a. It takes an experienced mail carrier 3 hours to do the same

job. How long would it take if they worked together?
Mathematics
1 answer:
Pani-rosa [81]3 years ago
4 0

Answer: \frac{12}{7}\ \text{hours}

Step-by-step explanation:

Given

New mail carrier takes 4 hours for delivery i.e.

New mail carrier completes \frac{1}{4} part of work in 1 hour

Old mail carrier takes 3 hours for delivery  i.e.

mail carrier completes \frac{1}{3}  part of work in 1 hour

If they work together, they complete the work in x hours i.e.

\Rightarrow \dfrac{1}{x}=\dfrac{1}{4}+\dfrac{1}{3}\\\Rightarrow \dfrac{1}{x}=\dfrac{3+4}{12}\\\Rightarrow x=\dfrac{12}{7}\ \text{hours}

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Evgesh-ka [11]

Answer:

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Step-by-step explanation:

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7 0
2 years ago
What is the volume of a sphere if d= 2.28 in
Debora [2.8K]
V=4/3 x pi r cubed thats the ewuation for the volume of a sphere
3 0
3 years ago
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Which graph represents the sequence: 80, -40, 20
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8 0
3 years ago
Write parametric equations of the line through the points (7,1,-5) and (3,4,-2). please use the first point as your base-point w
Roman55 [17]

Given:

A line through the points (7,1,-5) and (3,4,-2).

To find:

The parametric equations of the line.

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Direction vector for the points (7,1,-5) and (3,4,-2) is

\vec {v}=\left

\vec {v}=\left

\vec {v}=\left

Now, the perimetric equations for initial point (x_0,y_0,z_0) with direction vector \vec{v}=\left, are

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z=z_0+ct

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WITCHER [35]

Answer:

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Step-by-step explanation:

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