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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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ರೈಲು A 260 m ಉದ್ದವಿದ್ದು, 160 m ಉದ್ದದ ವೇದಿಕೆಯನ್ನು 28 ಸೆಕೆಂಡುಗಳಲ್ಲಿ ದಾಟುತ್ತದೆ. ರೈಲು B 340 m ಉದ್ದವಿದ್ದು, ಸ್ಥಿರ ಮನುಷ್ಯನನ್ನು 20 ಸೆಕೆಂಡುಗಳಲ್ಲಿ ದಾಟುತ್ತದೆ. ಎರಡೂ ರೈಲುಗಳು ಸಮಾನಾಂತರ ನೇರ ಹಳಿಗಳಲ್ಲಿ ಸ್ಥಿರವಾದ ವೇಗದಲ್ಲಿ ಚಲಿಸುತ್ತವೆ. ವೇಗವಾದ ರೈಲು ನಿಧಾನವಾದ ರೈಲನ್ನು ಒಂದೇ ದಿಕ್ಕಿನಲ್ಲಿ ಚಲಿಸುವಾಗ ಸಂಪೂರ್ಣವಾಗಿ ಹಿಂದಿಕ್ಕಲು ತೆಗೆದುಕೊಳ್ಳುವ ಸಮಯವನ್ನು (ಸೆಕೆಂಡುಗಳಲ್ಲಿ) ಕಂಡುಹಿಡಿಯಿರಿ?
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Calculate speeds separately: SA=(260+160)/28=15 m/s, SB=340/20=17 m/s. Relative speed = 17−15=2 m/s. Time = sum of lengths / relative speed = (260+340)/2=300 seconds.
Train A: length = 260 m, crossing 160 m platform in 28 s. Train B: length = 340 m, crossing a man in 20 s.
Speed=TimeDistance, Relative Speed=SB−SA, Time=Relative SpeedTotal Length
Calculate speeds separately: SA=(260+160)/28=15 m/s, SB=340/20=17 m/s. Relative speed = 17−15=2 m/s. Time = sum of lengths / relative speed = (260+340)/2=300 seconds.
Students often add the lengths of both trains when crossing a man or a platform, but you must only add the lengths of the two trains when they are overtaking each other.
Calculate speed of Train A
Train A covers its own length plus the platform length. Total distance = 260+160=420 m. SA=420/28=15 m/s.
SA=28260+160=15 m/s
Calculate speed of Train B
Train B crosses a stationary man, so it covers only its own length. SB=340/20=17 m/s.
SB=20340=17 m/s
Calculate relative speed and time to overtake
Since trains move in the same direction, relative speed is the difference of speeds. Total distance to cover is the sum of both train lengths: 260+340=600 m.
Time=17−15260+340=2600=300 s
D is correct because the faster train (Train B) overtakes Train A in 300 seconds.
This concept is fundamentally identical to circular track problems where the faster runner laps the slower runner by the circumference of the track.