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16 Jan 2004, 13:24
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Two trains, 400 and 320 metres long take a minute to cross each other while travelling in the same direction and take only 10 seconds when they cross in opposite directions. What is the speed of the faster train?
{1km/hr=5/18m/s}
a.32kmph
b.126
c.108
d.42
e.None of these
{1km/hr=5/18m/s}
a.32kmph
b.126
c.108
d.42
e.None of these
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16 Jan 2004, 15:29
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E, none of these? I am getting 151.2 kmph. Let the speeds of the train be x & y mps, so when they are travelling in the same direction we subtract speeds and in the opposite direction we add speeds becoz of the Relative speed.
Length of both the trains = 720 ,
so 720/(x-y) = 60 secs and so x-y = 12 mps ------------ (1)
720/(x+y) = 10 secs and so x+y = 72 mps ------------(2)
solving for x and y we get x=42 mps and y= 30 mps and 42 mps= 151.2 kmph
Length of both the trains = 720 ,
so 720/(x-y) = 60 secs and so x-y = 12 mps ------------ (1)
720/(x+y) = 10 secs and so x+y = 72 mps ------------(2)
solving for x and y we get x=42 mps and y= 30 mps and 42 mps= 151.2 kmph
16 Jan 2004, 15:32
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:band :musband :woohoo
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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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