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Montano1993 [528]
3 years ago
13

A "Local" train leaves a station and runs at an average rate of 35 mph. An hour and a half later an "Express" train leaves the s

tation and travels at an average rate of 56 mph on a parallel track. How many hours after the Express train starts will the it overtake the Local?
Mathematics
2 answers:
Phantasy [73]3 years ago
8 0
Hello,

Let's assume x the time the express runs.

56*x=35*(1.5+x)
==>21x=52.5

==>x=2.5 h =2 h 30 min
Bogdan [553]3 years ago
3 0
X=2.5 h =2 h. 30 min.
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Answer:

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Step-by-step explanation:

In general a system of equations can be represented as ax+by=c and dx+ey=f. In order this system of equations to have NO SOLUTIONS a/d=b/a≠c/f. In our example a=6, b=4, c=14, d=3, e=2 and f=k. To apply the formula above, 6/3=4/2≠14/k. Hence k≠7. It can be concluded that except k=7, any real number for k would cause the system of equations to have no solutions.

Just for information, if k=7 the system will have infinitely many solutions.

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3 years ago
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Nadusha1986 [10]

Answer:

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Step-by-step explanation:

The standard form of an equation of a line:

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Convert

4y=2.4x+1.8          <em>multiply both sides by 10</em>

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Hi there!

From this problem we can pull out some key information and remove any excess.

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