Speed, Time and Distance

Speed, Time and Distance

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Aptitude miscellaneous
  1. If a motor car covers a distance of 250 m in 25 second, What is its speed in kilometer per hour ?








  1. View Hint View Answer Discuss in Forum

    Speed of the motor car in meter per second = 250 / 25
    = 10 m/s

    Speed in km/hr = (18/5) x speed in m/s

    Correct Option: D

    Speed of the motor car in meter per second = 250 / 25
    = 10 m/s

    Speed in km/hr = (18/5) x speed in m/s
    = 10 x (18 / 5) km/hour
    =36 km/hour.

  1. A train is running with the speed of 45 km/hour. What is its speed in meter per second ?








  1. View Hint View Answer Discuss in Forum

    Speed of a train in kilometer per hour = 45
    Speed in meter per second = ( 5/18 ) x Speed in kilometer per hour

    Correct Option: A

    speed of a train in kilometer per hour =45

    Speed in meter per second = ( 5/18 ) x Speed in kilometer per hour
    = 45 x 5/18
    = 12.5 kmph

  1. By walking at 3/4 of his usual speed , a man reaches his office 20 minutes later than usual . this usual time is ?








  1. View Hint View Answer Discuss in Forum

    At 3/4 of the usual speed, the time taken is 4/3 of the usual time
    ∴ 4/3 of usual time - usual time = 20 min

    Correct Option: B

    At 3/4 of the usual speed, the time taken is 4/3 of the usual time
    ∴ 4/3 of usual time - usual time = 20 min
    ⇒ 4x/3 - x = 20
    ⇒ x/3 = 20
    ∴ x = 60 min.

  1. A man, on tour travel first 160 km. at 64 km/hr. and the next 160 km. at 80 km/hr. The average speed for first 320 km. of the tour is ?








  1. View Hint View Answer Discuss in Forum

    Average speed = 2uv / ( u + v ) km/hr

    Correct Option: B

    Average speed = 2uv / ( u + v ) km/hr
    =(2 x 64 x 80) / (64 + 80) km/hr
    = (2 x 64 x 80) / 144 km/hr.
    = 71.11 km/hr

  1. The ratio between the rates of walking of A and B is 2:3 , if the time taken by B to cover a certain distance is 36 minutes, the time taken by A to cover that much distance is ?








  1. View Hint View Answer Discuss in Forum

    Ratio of speed = 2 : 3
    Ratio of times taken for same distance = 1/2 : 1/3
    From question 1/2 : 1/3 = t : 36

    Correct Option: B

    Ratio of speed = 2 : 3
    Ratio of times taken for same distance = 1/2 : 1/3
    From question 1/2 : 1/3 = t : 36
    ⇒ (1/3) x t = (1/2) x 36
    ∴ x = 54 min .