1
   

Physics word problem - trains

 
 
Reply Sun 6 Jan, 2013 11:30 am
There are two cities (A and B). On a train from A to B, every 50 minutes the train meets another train going in the opposite direction (from B to A), on a parallel track. Constant speed of the train(A to B) is 90 km/hr and the speed of all approaching trains is 120km/hr (B to A). Someone assumes that the approaching trains leave her home town at regular intervals and travel at constant speed, and is able to calculate the time period between their departures. Duplicate her calculations (answer in minutes)
  • Topic Stats
  • Top Replies
  • Link to this Topic
Type: Question • Score: 1 • Views: 1,915 • Replies: 3
No top replies

 
View best answer, chosen by greatestever298
DrewDad
 
  1  
Reply Sun 6 Jan, 2013 12:02 pm
@greatestever298,
I get 87.5 minutes apart.
greatestever298
 
  1  
Reply Sun 6 Jan, 2013 12:09 pm
@DrewDad,
How did you get that, can you post the solution, thats the right answer.
DrewDad
  Selected Answer
 
  2  
Reply Sun 6 Jan, 2013 01:55 pm
@greatestever298,
The trains pass every 50 minutes, so the distance between the BA trains can be calculated using the combined speeds of the AB and BA trains.

Then you can calculate the time between trains, by using the speed of BA train, and the distance between the BA trains.
0 Replies
 
 

Related Topics

Why does time not exist? - Discussion by edgarblythe
Putting Time In Perspective - Discussion by Olivier5
What happens when time stop? - Question by 5D
Time simply does not exist - Discussion by xxxx
The elusive NOW - Discussion by Rickoshay75
Time - Question by Genius600
simple relativity question - Question by ralphiep
How do you define Time? - Discussion by tcis
Alternative to expanding universe theory - Discussion by Eli Genkin
 
  1. Forums
  2. » Physics word problem - trains
Copyright © 2019 MadLab, LLC :: Terms of Service :: Privacy Policy :: Page generated in 0.03 seconds on 04/25/2019 at 12:13:01