1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Find time

  1. May 25, 2008 #1
    1. two trains 200 meteres and 150 meters are running on the parallel rails at this rate of 40 km/hr and 45 km/hr.in how much time will they cross each other if they are running on the same direction



    2. Relevant equations



    3. speed=distance/time
    train1 =200*40*5/18
    train2=150*45*5/18
     
  2. jcsd
  3. May 25, 2008 #2

    Chi Meson

    User Avatar
    Science Advisor
    Homework Helper

    All that matters are their relative displacement and their relative speed.

    How far apart are they, initially?

    What is the difference in their speeds?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook