SOLUTION: Two trains leave Chicago at the same time and in opposite directions. One is going 120MPH and one is going 130MPH. How long before they are 750 miles apart?
Answer: 6
I am no
Algebra.Com
Question 619487: Two trains leave Chicago at the same time and in opposite directions. One is going 120MPH and one is going 130MPH. How long before they are 750 miles apart?
Answer: 6
I am not sure my equation is correct.
750/120=6
750/130= 5.7
I rounded up and came to conclusion that 6hr would be the average time. Is this correct? If not whats the equation I need to use. Thank you.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Train 1:
d = rt
d = 120t
Train 2:
d = rt
d = 130t
--------------------------
So train 1 has traveled 120t miles in t hours and train 2 has traveled 130t miles in t hours.
Since they are going in opposite directions (along let's assume a straight track), they will be 120t+130t = 250t miles apart after t hours.
We want this distance to be 750, so
250t = 750
t = 750/250
t = 3
So in 3 hours, the two trains will be 750 miles apart.
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