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    Kumar H P's Avatar
    Kumar H P Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Nov 2, 2007, 04:35 AM
    Time calculation
    Two trains are running at the same time facing each other between
    Distances of 100 kms. One train is traveling at 10kms per hour and another
    At 8kms per hour. Within how much time (rounded to Hrs and Minutes) both
    Trains will meet.

    A. 5 Hrs 34 Minutes B. 6 Hrs 4 Minutes C. 5 Hrs 4 Minutes
    D. 6 Hrs 34 Minutes
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
    Uber Member
    		  
    #2

    Nov 2, 2007, 05:54 AM
    Just change the frame of reference: Assume that one train is stationary and that the other train is travelling at the sum of the speed of the 2. Now the question is trivial.
    terryg752's Avatar
    terryg752 Posts: 197, Reputation: 4
    Junior Member
    		  
    #3

    Nov 2, 2007, 06:26 AM
    Relative speed of each towards the other is 18km per hour

    (Every hour, they are 18km closer to each other)

    So divide the distance by 18 to get your Answer
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