Help with my math please!!!
2 answers:
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Answer:
Step-by-step explanation:
To answer this problem, we must bear in mind that the express train travels 3 times faster than the freight train.
If we call F the distance that the freight train travels and we call E at the distance that the express train travels, we must have the distance between them after 15 minutes it must be 30 miles.
So
We also know that:
Since the express train travels 3 times faster than the freight train.
So, like both equations, we have to:
Then miles in the opposite direction.
This is the distance you traveled in 15 minutes.
Therefore, the speed of the express train () is the distance traveled between the time it did
To solve this, you need to isolate/get the variable "a" by itself in the equation:
-8a + 32 = 72 Subtract 32 on both sides
-8a + 32 - 32 = 72 - 32
-8a = 40 Divide -8 on both sides to get "a" by itself
a = -5
PROOF
-8a + 32 = 72 Substitute/plug in -5 into "a" since a = -5
-8(-5) + 32 = 72 (two negative signs cancel each other out and become positive)
40 + 32 = 72
72 = 72