Speed, Time and Distance

Speed, Time and Distance

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Aptitude miscellaneous
  1. Ram and Sita are walking towards each other with the speed of 8 km/h and 2 km/h, respectively over a road 160 km long. How soon will they meet ?








  1. View Hint View Answer Discuss in Forum

    Distance = 160 km
    Relative Speed = 8 + 2 = 10

    Correct Option: A

    Distance = 160 km
    Relative Speed = 8 + 2 = 10
    Time = Distance/Relative speed = 160/10 = 16 h

  1. A man walks 7.5 km at a speed of 3 km/h. At what speed would the man need two walk during the next 2 h to have an average of 4 km/h for the entire session ?








  1. View Hint View Answer Discuss in Forum

    Let speed of walking be V km/h.
    Total time taken = (7.5/3) + 2 = 4.5 h
    Total distance covered = (7.5 + 2V) km
    ∴ (7.5 + 2V)/4.5 = 4

    Correct Option: C

    Let speed of walking be V km/h.
    Total time taken = (7.5/3) + 2 = 4.5 h
    Total distance covered = (7.5 + 2V) km
    ∴ (7.5 + 2V)/4.5 = 4
    ⇒ 7.5 + 2V = 18
    ⇒ 2V = 10.5
    ⇒ V = 5.25
    ∴ Speed of walking = 5.25 km/h

  1. A man in car notices that he can count 25 telephone posts in 1 min. If they are known to be 40 m apart, then at what speed is the car travelling ?








  1. View Hint View Answer Discuss in Forum

    Number of gaps between 25 telephone posts = 24
    Distance travelled in 1 min = 40 x 24 = 960 m

    Correct Option: B

    Number of gaps between 25 telephone posts = 24
    Distance travelled in 1 min = 40 x 24 = 960 m
    Speed = (960 x 60)/1000 = 57.6 km/h

  1. A man performs 2/25 of his total journey by bus, 21/50 by car and the remaining 2 km on foot. Find the total distance covered in the whole journey. ?








  1. View Hint View Answer Discuss in Forum

    Let total distance covered in the whole journey = L km
    ∴ 2L/25 + 21L/50 + 2 = L

    Correct Option: A

    Let total distance covered in the whole journey = L km
    ∴ 2L/25 + 21L/50 + 2 = L
    ⇒ L = 4
    ∴ Total distance covered = 4 km

  1. One local and another express train were proceeding in the same direction on parallel tracks at 29 km/h and 65 km/h, respectively. The driver of the former noticed that it took exactly 16 s for the faster train to pass by him. What is the length of the faster train ?








  1. View Hint View Answer Discuss in Forum

    Relative speed of express train to local train = 65 - 29 = 36 km/h
    = 36 x (5/18) m/s = 10 m/s

    Correct Option: C

    Relative speed of express train to local train = 65 - 29 = 36 km/h
    = 36 x (5/18) m/s = 10 m/s
    ∴ Length of faster train = 10 x 16 = 160 m