Speed, Time and Distance


  1. How long does a train, 75 metre long, moving at 60 km/hr take to pass a certain telegraph post?
    1. 3.5 seconds
    2. 4.5 seconds
    3. 5 seconds
    4. 5.4 seconds

  1. View Hint View Answer Discuss in Forum

    Distance covered by train = Length of train
    Speed of train = 60 kmph

    =
    60 × 5
    m./sec.
    18

    =
    50
    m./sec.
    3

    ∴  Required time =
    Distance
    Speed

    =
    75
    seconds
    (50/3)

    =
    75 × 3
    seconds
    50

    = 4.5 seconds

    Correct Option: B

    Distance covered by train = Length of train
    Speed of train = 60 kmph

    =
    60 × 5
    m./sec.
    18

    =
    50
    m./sec.
    3

    ∴  Required time =
    Distance
    Speed

    =
    75
    seconds
    (50/3)

    =
    75 × 3
    seconds
    50

    = 4.5 seconds


  1. A train 240 metres in length crosses a telegraph post in 16 seconds. The speed of the train is
    1. 50 km/hr
    2. 52 km/hr
    3. 54 km/hr
    4. 56 km/hr

  1. View Hint View Answer Discuss in Forum

    When a train crosses a pole it travels a distance equal to its length.

    ∴  Speed of train =
    240
    = 15 m./sec.
    16

    = 15 ×
    18
    kmph.
    5

    = 54 kmph.

    Correct Option: C

    When a train crosses a pole it travels a distance equal to its length.

    ∴  Speed of train =
    240
    = 15 m./sec.
    16

    = 15 ×
    18
    kmph.
    5

    = 54 kmph.



  1. In what time will a train, 60 metre long, running at the rate of 36 km/hr pass a telegraph post ?
    1. 9 seconds
    2. 8 seconds
    3. 7 seconds
    4. 6 seconds

  1. View Hint View Answer Discuss in Forum

    Speed of train = 36 kmph

    =
    36 × 5
    m./sec.
    18

    = 10 m./sec.
    ∴  Required time =
    Length of train
    Speed of train

    =
    60
    = 6 seconds
    10

    Correct Option: D

    Speed of train = 36 kmph

    =
    36 × 5
    m./sec.
    18

    = 10 m./sec.
    ∴  Required time =
    Length of train
    Speed of train

    =
    60
    = 6 seconds
    10


  1. A train 150m long passes a telegraphic post in 12 seconds. Find the speed of the train.(in km/hr)
    1. 50
    2. 12.5
    3. 25
    4. 45

  1. View Hint View Answer Discuss in Forum

    Distance covered by train in crossing a telegraphic post = length of train

    ∴  Speed of train =
    Distance
    Time

    =
    150
    m./sec.
    12

    =
    150
    ×
    18
    kmph
    125

    = 45 kmph

    Correct Option: D

    Distance covered by train in crossing a telegraphic post = length of train

    ∴  Speed of train =
    Distance
    Time

    =
    150
    m./sec.
    12

    =
    150
    ×
    18
    kmph
    125

    = 45 kmph



  1. In what time will a 100 metre long train running with a speed of 50 km/hr cross a pillar ?
    1. 7.0 seconds
    2. 72 seconds
    3. 7.2 seconds
    4. 70 seconds

  1. View Hint View Answer Discuss in Forum

    Speed of train = 50 kmph

    =
    50 × 5
    m./sec.
    18

    =
    125
    m./sec.
    9

    ∴ Required time =
    (100/125)
    seconds
    9

    =
    100 × 9
    seconds
    125

    = 7.2 seconds

    Correct Option: C

    Speed of train = 50 kmph

    =
    50 × 5
    m./sec.
    18

    =
    125
    m./sec.
    9

    ∴ Required time =
    (100/125)
    seconds
    9

    =
    100 × 9
    seconds
    125

    = 7.2 seconds