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ipn [44]
3 years ago
11

A train that is 80 meters long travels 240 meters in 6 seconds. How many seconds would it take the train to pass through a 480 m

eter long tunnel.
Mathematics
2 answers:
snow_tiger [21]3 years ago
5 0
Speed=distance / time
Data:
distance=240 m
time=6 s

Speed of this train=240 m / 6 s=40 m/s

The train pass through 480 meters of tunnel, therefore the distance will be:
distance of the tunnel + distance of the train= 480 m + 80 m=560 m

speed=distance / time   ⇒  Time=distance / speed
Data:

distance=560 m
speed=40 m/s

Time=560 m/ (40 m/s)=14 s

Answer: 14 seconds will take the train to pass through a 480 m long tunnel. 
Elena L [17]3 years ago
3 0

Answer:

Speed=distance / time

Data:

distance=240 m

time=6 s

Speed of this train=240 m / 6 s=40 m/s

The train pass through 480 meters of tunnel, therefore the distance will be:

distance of the tunnel + distance of the train= 480 m + 80 m=560 m

speed=distance / time   ⇒  Time=distance / speed

Data:

distance=560 m

speed=40 m/s

Time=560 m/ (40 m/s)=14 s

Answer: 14 seconds will take the train to pass through a 480 m long tunnel

Step-by-step explanation:

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Answer:

(A) y= -1.026x^2 + 1016.402x - 162075

Step-by-step explanation:

Here is the options to the question

Which equation best represents the data?

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B) y= -1.036x^2 + 1024.771x - 163710

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D) y= 196.2x – 18710

(A) y= -1.026x^2 + 1016.402x - 162075

The data above represents the company's profit based on number of items produced.

To get the equation which best represents the data, we have to substitute the value of x into the given equations  

By substituting x=100 in first equation, we have:

y = -1.02x² + 1016.402x – 162075

y = -1.026(100)² + 1016.402(100) – 162075

y = -70500

y = -70500

Option A satisfies.

Using the second equation  

When x = 100

y = -1.036x^2 + 1024.771x - 163710

y = -1.036(100)² + 1024.771(100) - 163710

y = -10360 + 102477.1 – 163710

y = -71592.9

Option B doesn’t satisfies  

We can also replace the various values of x in the equations to check whether or not they satisfy.

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