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A train 300 m long crossed a platform 900 m long in 1 minutes 12 seconds. The speed of the train (in km/hr) is
A. 40
B. 50
C. 60
D. 70

  • -6
A train 300 m long crossed a platform 900 m long in 1 minutes 12 seconds. The speed of the train (in km/hr) is
A. 40
B. 50
C. 60
D. 70
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11 Answers

  1. initially the speed of train is 300/72 m/s and it has to cross platform of 900 m so it has to have a speed of 900/72 m/s
    so the total speed of train is
    300+900/72 m/s
    1200/72 m/s
    so 1 hr=3600 sec
    but already it has taken 72 sec
    so t=3600/72=50
    muliply and divide by 50
    so
    1200*50/72*50=60000/3600 m/s
    1000m=1km
    3600sec=1hr
    so
    60km/hr is the answer

    • -2
  2. Total Distance = 1200
    total time = 72 sec

    Speed = D/t
    =1200/72
    =16.67m/s
    SI = 16.67×3600/1000
    = 60km/h

    • 0
  3. 300+900=1200
    For
    1200 m – 72 sec
    For
    1000m – ?
    Cross multiplication
    1000×72/1200=60 km/h

    • 3
  4. Speed = D/T
    distance is 300+900=1200m
    time is 1 min 12 sec i.e 72sec
    speed = 1200/72 m/sec
    1200/1000=1.2 distance in km
    72/60=1.2, 1.2/60=0.02 time in hours.
    speed = d/t
    => 1.2/0.02 (multiply numerator and denominator by 100)
    =>120/2
    = 60km/hr

    • 3
  5. Total distance to be coverd by train (300+900=1200m)
    Total time taken 72 sec.
    So Speed will be= d/t
    12*100/72=50/3 m/sec
    For Coverting m/sec into km/hr
    We need to multiply it by 18/5
    I.e. 50*18/3*5= 60km/hr

    • 2
  6. Time =1 min 12 s=72 s
    Distance covered in 72 second =300+900=1200 m
    Speed=
    time
    distance

    Speed=(
    72
    1200

    )m/sec=(
    3
    50

    )m/sec=(
    3
    50

    ×
    5
    18

    )=60km/hr

    • -1
  7. Length of train 🚆 = 300 m
    Platform length = 900 m
    Total Length= 300+900 = 1200m
    Speed ⏩ = Distance/Time
    Here, Time is 1 minutes 12 seconds. ( 72 seconds)
    Speed = 1200/72= 16.6667m/s to convert this into km/hr
    For that 16.6667×(18/5) = 60 km/hr

    Good time 😊👍

    • 9
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