Apassenger train and a freight train leave san jose at 3pm, traveling in the same direction. the passenger train is going three times as fast as the freight train. at 6pm they are 240 miles apart. how fast is each travelling? pls me. i am hopeless

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.

Verification to this question is in the image:

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

i believe the answer is c.