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Two parallel rail lines are directed as ...

Two parallel rail lines are directed as north- south. A train X runs towards north with a speed of `15m*s^(-1)` and another train Y runs towards south with a speed of `25 m*s^(-1)` .
(ii) the velocity of ground with respect to Y,

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Let us assume the velocity from south to north be positive. Then,
Velocity of x, `v_(X)=+15m*s^(-1)`
and velocity of Y, `v_(Y)=-25m*s^(-1)`
(ii) The relative velocity of ground with respect to train Y is
`v_(GY)=v_(G)-v_(X)=0-(-25)=25 m*s^(-1)`
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