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A train leaves Chicago traveling west at 60 miles per hour. An hour later, another train leaves Chicago traveling east at 80 miles per hour.   When are the two trains the same distance from Chicago?

 Mar 11, 2020
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One train gets a 60 mile head start...its distance from Chicago will be given by

      60  +  60 x     miles      where x = hours after 2nd train starts

 

2nd train distance = 80 x     when are these two distances equal?

 

60 + 60x = 80x

x = 3 hours after sencond train starts      4 hours after first train started

 

 

Another way:

train 1 has 60 mile head start      train 2 travels 20 m/hr faster     to close that 60 mile head start will require  60 m / 20m/hr = 3 hours

 Mar 12, 2020

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