Question

Two parallel rail tracks run north – south. Train A of 120 m long moves north with speed 72 kmph and train B of 130 m long moves south with a speed 36 kmph. A bird is flying parallel to train B in the opposite direction with a speed 18 kmph and monkey running on the roof of the train A against it’s motion with a speed 18 kmph with respect to train A. 28. Velocity of train B w.r.t train A (1) 20m/ s (2) 10m/ s (3) 30m/ s (4) 40m/ s 29. Velocity of ground w.r.t train B (1) 20m/ s (2) 10m/ s (3) 30m/ s (4) 0m/ s 30. Velocity of monkey as observed by a man standing on the ground (1) 30m/ s (2) 20m/ s (3) 5m/ s (4) 25m/ s 31. Time after which train B crosses the bird. (1) 6.5sec (2) 6.8sec (3) 8.6sec (4) 12.5sec

Answer 1

Explanation:

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