A train of 150 m length is going towards north direction at a speed of \[10\,\text{m}{{\text{s}}^{-1}}.\] A parrot flies at a speed of \[\text{5}\,\text{m}{{\text{s}}^{-1}}\] towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to
A) 12s
B) 8 s
C) 15s
D) 10 s
Correct Answer:
D
Solution :
Time taken \[=\frac{\text{distance}}{\text{relative}\,\text{velocity}}=\frac{150}{10+5}=10\,s.\]