A 175 m long train is traveling along a straight track with a velocity 72 km-1 h . A bird is flying parallel to the train in the opposite direction with a velocity 18 km-1 h . The time taken by the bird to cross the train is

Question

A 175 m long train is traveling along a straight track with a velocity 72 km-1 h . A bird is flying parallel to the train in the opposite direction with a velocity 18 km-1 h . The time taken by the bird to cross the train is (A)  35 s  (B)  27 s  (C)  11.6 s  (D)  7 s

Tardigrade Admin · Accepted Answer

Velocity of train, vT=72 km/h=72×(5/18) m/s=20 m/s Velocity of bird, vB=18 km/h=18×(5/18) m/s=5 m/s Since bird is flying parallel to train in opposite direction. ∴ Relative velocity of bird w.r.t. train = vB + vT = 25 m/s Trainâs length = 175 m Time taken by the bird to cross the train is =(175/25)=7 s

Q. A $175 m$ long train is traveling along a straight track with a velocity $72 k m^{- 1} h$ . A bird is flying parallel to the train in the opposite direction with a velocity $18 k m^{- 1} h$ . The time taken by the bird to cross the train is

$35 s$

$27 s$

$11.6 s$

$7 s$

Q. A 175m long train is traveling along a straight track with a velocity 72km−1h . A bird is flying parallel to the train in the opposite direction with a velocity 18km−1h . The time taken by the bird to cross the train is

35s

27s

11.6s

7s

Q. A $175 m$ long train is traveling along a straight track with a velocity $72 k m^{- 1} h$ . A bird is flying parallel to the train in the opposite direction with a velocity $18 k m^{- 1} h$ . The time taken by the bird to cross the train is

$35 s$

$27 s$

$11.6 s$

$7 s$