A 100 m long train is travelling from North to South at a speed of 30ms^(-1). A bird is flying from South to North at a speed of 10ms^(-1). How long will the bird take to cross the train?

A 100 m long train is travelling from North to South at a speed of 30m

1.	A 100 m long train is travelling from North to South at a speed of 30ms^(-1). A bird is flying from South to North at a speed of 10ms^(-1). How long will the bird take to cross the train?
Answer» <html><body><p>3s<br/>2.5s<br/>10s<br/>5s</p>Solution :Length of <a href="https://interviewquestions.tuteehub.com/tag/train-1425202" style="font-weight:bold;" target="_blank" title="Click to know more about TRAIN">TRAIN</a> = 100 m <br/> <a href="https://interviewquestions.tuteehub.com/tag/bird-898337" style="font-weight:bold;" target="_blank" title="Click to know more about BIRD">BIRD</a> and train are moving in a opposite direction <br/> `:.` Relative velocity `=30+10=40ms^(-1)` <br/> Time taken to cross the train (t) `=("distance")/("R.velocity")=(100)/(<a href="https://interviewquestions.tuteehub.com/tag/40-314386" style="font-weight:bold;" target="_blank" title="Click to know more about 40">40</a>)=2.5s`.</body></html>