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AnnZ [28]
3 years ago
7

A freight train completes its journey of 150 miles 1 hour earlier if its original speed is increased by 5 miles/hours. What’s th

e original speed ?
Mathematics
1 answer:
Agata [3.3K]3 years ago
7 0
The original speed of the train was 25mph.
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Answer:

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Step-by-step explanation:

Based on the first clue, we find out that

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We can re-write the first equation to x = y - 5.

Therefore, the second equation can also be written as 5(y - 5) = 6y + 15

This can be simplified to 5y - 25 = 6y + 15

We can subtract 6y from each side, and add 25 to each side;

5y - 6y = 15 + 25

Therefore, -y = 40

Therefore y = -40.

Now let's plug this back into the original equation, to get : x  + 5 = -40

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