Speed, Time and Distance


  1. The speed of a bus is 72 km/hr. The distance covered by the bus in 5 seconds is
    1. 100 m
    2. 60 m
    3. 50 m
    4. 74.5 m

  1. View Hint View Answer Discuss in Forum

    Speed of bus = 72 kmph

    =
    72 × 5
    metre/second
    18

    = 20 metre/second
    ∴  Required distance
    = 20 × 5 = 100 metre

    Correct Option: A

    Speed of bus = 72 kmph

    =
    72 × 5
    metre/second
    18

    = 20 metre/second
    ∴  Required distance
    = 20 × 5 = 100 metre


  1. A person started his journey in the morning.
    At 11 a.m. he covered
    3
    of the journey and on the
    8
    same day at 4.30 p.m. he covered
    5
    of the journey.
    6

    He started his journey at
    1. 6.00 a.m.
    2. 3.30 a.m.
    3. 7.00 a.m.
    4. 6.30 a.m.

  1. View Hint View Answer Discuss in Forum

    Difference of time = 4.30 p.m – 11.a.m.

    = 5
    1
    hours =
    11
    hours
    22

    Distance covered in
    11
    hrs
    2

    =
    5
    3
    =
    20 − 9
    =
    11
    part
    682424

    ∵  
    11
    part of the journey is covered in
    11
    hours
    242

    ⇒ 
    3
    part of the journey is covered in
    8

    =
    11
    ×
    24
    ×
    3
    =
    9
    hours
    21182

    = 4
    1
    hours.
    2

    Clearly the person started at 6.30 a.m.

    Correct Option: D

    Difference of time = 4.30 p.m – 11.a.m.

    = 5
    1
    hours =
    11
    hours
    22

    Distance covered in
    11
    hrs
    2

    =
    5
    3
    =
    20 − 9
    =
    11
    part
    682424

    ∵  
    11
    part of the journey is covered in
    11
    hours
    242

    ⇒ 
    3
    part of the journey is covered in
    8

    =
    11
    ×
    24
    ×
    3
    =
    9
    hours
    21182

    = 4
    1
    hours.
    2

    Clearly the person started at 6.30 a.m.



  1. A and B travel the same distance at speed of 9 km/hr and 10 km/hr respectively. If A takes 36 minutes more than B, the distance travelled by each is
    1. 48 km
    2. 54 km
    3. 60 km
    4. 66 km

  1. View Hint View Answer Discuss in Forum

    Let the distance between A and B be x km, then

    x
    x
    =
    36
    =
    3
    910605

    ⇒ 
    x
    =
    3
    905

    ⇒ x =
    3
    × 90 = 54 km.
    5


    Second Method :
    Here, S1 = 9, t1 = x
    S2 = 10, t2 = x −
    36
    60

    S1t1 = S2t2
    9 × x = 10x −
    36
    60

    9x = 10x – 6x = 6
    Distance travelled
    = 9 × 6 = 54 km

    Correct Option: B

    Let the distance between A and B be x km, then

    x
    x
    =
    36
    =
    3
    910605

    ⇒ 
    x
    =
    3
    905

    ⇒ x =
    3
    × 90 = 54 km.
    5


    Second Method :
    Here, S1 = 9, t1 = x
    S2 = 10, t2 = x −
    36
    60

    S1t1 = S2t2
    9 × x = 10x −
    36
    60

    9x = 10x – 6x = 6
    Distance travelled
    = 9 × 6 = 54 km


  1. A man riding his bicycle covers 150 metres in 25 seconds. What is his speed in km per hour ?
    1. 25
    2. 21.6
    3. 23
    4. 20

  1. View Hint View Answer Discuss in Forum

    Speed =
    150
    = 6 m/sec
    25

    = 6 ×
    18
    =
    108
    = 21.6 kmph
    55

    Correct Option: B

    Speed =
    150
    = 6 m/sec
    25

    = 6 ×
    18
    =
    108
    = 21.6 kmph
    55



  1. A train is moving with the speed of 180 km/hr. Its speed (in metres per second) is :
    1. 5
    2. 40
    3. 30
    4. 50

  1. View Hint View Answer Discuss in Forum

    Speed = 180 kmph

    =
    180 × 5
    m/sec = 50 m/sec
    18

    ∵   1 km/hr =
    5
    m/s
    18

    Correct Option: D

    Speed = 180 kmph

    =
    180 × 5
    m/sec = 50 m/sec
    18

    ∵   1 km/hr =
    5
    m/s
    18