Two trains leave the same station at the same time, but are headed in opposite directions. One train travels at 70 mph and the other train travels at 80 mph.

How much times passes until the trains are 600 mi apart?

Question

Two trains leave the same station at the same time, but are headed in opposite directions. One train travels at 70 mph and the other train travels at 80 mph.

How much times passes until the trains are 600 mi apart?

jabez177 · Answer

@SerenityJustice74

tkhunny · Answer

How long does it take to go 600 miles at 150 mph?

mathmale · Answer

Since the trains are traveling in opposite directions, they are separating at 150 mph.  This is the sum of 70 and 80 mph.

mathmale · Answer

distance = rate * time

Substitute the two unknowns into this formula and solve for the unknown.

jabez177 · Answer

So 70 x 600 
then 80 x 600
?

mathmale · Answer

You need to calculate time.  Were you to multiply 70 by 600, you'd get 42,000.  That would not make much sense, would it?

Again, distance = rate * time.

You want time.

Thus, divide distance traveled by the rate:  600 miles divided by 150 miles per hour.
Be careful with those units of measurement; don't drop them!

jabez177 · Answer

So I do 600 divided by 70 then 600 divided by 80. 
Then I do The sum of those two multiplied by 600, right?

mathmale · Answer

No.  600 miles is the TOTAL distance between the 2 trains.

Again:  distance = rate * time, and time =distance / rate

agent0smith · Answer

The first couple of posts by tkhunny and mathmale should've been enough...

likeabossssssss · Answer

plz close this @jabez177