d
Choose the positive direction of \(x\) -axis to be from south to north. Then Velocity of train \(v_{T}=+10 m s ^{-1}\)

Velocity of parrot \(v_{P}=-5 m s ^{-1}\) Relative velocity of parrot with respect to train

\(=v_{P}-v_{T}=\left(-5 ms ^{-1}\right)-\left(+10 ms ^{-1}\right)=-15 m s ^{-1}\)

i.e. parrot appears to move with a speed of \(15 m s ^{-1}\) from north to south

\(\therefore\) Time taken by parrot to cross the train

\(=\frac{150 m }{15 ms ^{-1}}=10 s\)