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Need help with simple math problem. (lemmy.ml)

submitted 2 months ago by Donatello@lemmy.ml to c/math@lemmy.ml

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Hi,

I found online a nice (and seemed easy) math problem.

Rocket A travel from Mars to Earth in 200 days
Rocket B travel from Earth to Mars in 150 days, but take off 30 days later

When they cross each other, which one is the closet to the earth ?

So they give a "flat" answer, without giving any explanation on how they reach this conclusion.

What would be your simplest Mathematical solution for this ?

Thanks.

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[–] Donatello@lemmy.ml 2 points 1 month ago

@MrJameGumb@lemmy.world No you were right at first ! the question is

When they cross each other, which one is the closet to the earth ?

So indeed when they cross they are the same point in space (more or less otherwise it's a collision :) ) so if they are at the same point the are at the same distance to Earth... :)