Alejandro has 3 times as many playlists as Derrick does. Alejandro has 24 playlists. If d = the number of playlists Derrick has,
2 answers:
Answer:
Derrick has 8 playlists in his possession.
Step-by-step explanation:
If Derrick as x amount of playlists, then if Alejandro has 3 times as many playlists as Derrick then he has 3x. Now if Alejandro has 24 playlists we can create the following mathematical expression to figure out how many playlists Derrick has.
.... divide both sides by 3
We can now see that Derrick has 8 playlists.
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Let's say that the speed of the freight train is and the one of the passenger train is
.
MPH means every hour the freight train covers
miles., which means in 3h it will have covered 3 times as much:
mi.
Following the same logic, MPH means every hour the passenger train covers
miles, meaning after 3h it will have covered 3 times as much as well:
mi.
Now, having expressed those distances and speeds algebraically, we find the difference between the two distances covered after 3h, knowing it will be equal to 240:
Knowing this, we can surely affirm that the freight train is travelling at 40MPH and the passenger train is travelling three times as fast, 120MPH.
Answer:
Step-by-step explanation:
There's a calculated explanation below. I hope this helps!
