Speed, Time and Distance

  1. A and B are 20 km apart. A can walk at an average speed of 4 km/hr and B at 6 km/h. If they start walking towards each other at 7:000 am, when they will meet?
    1. 8:00 am
    2. 8:30 am
    3. 9:00 am
    4. 10:00 am

  1. View Hint View Answer Discuss In Forum

    Sum of distance traveled by them after T hours
    6T + 4T = 20 KM
    T = 2 hours.

    Correct Option: C

    Suppose they will meet after T hours.
    Distance = Speed x Time
    Sum of distance traveled by them after T hours
    6T + 4T = 20 km
    T = 2 hours.
    So they will meet at 7:00 AM + 2 hours = 9:00 AM


  1. Arjun runs a distance of 1500 m in 5 minutes. What is his speed in Km/hr ?
    1. 16 km/hr
    2. 18 km/hr
    3. 15 km/hr
    4. 20 km/hr

  1. View Hint View Answer Discuss In Forum

    Speed in Km/hr = Speed in m/sec x 18/5

    Correct Option: B

    Speed = (1500/300 ) m/sec
    = 5 m/sec
    = (5 x 18/5 ) km/hr
    = 18 km/hr


  1. In how many minutes will Rohit cover a distance of 800 m, if he runs at speed of 10 km/hr?
    1. 5 min 12 sec
    2. 4 min 40 sec
    3. 5 min
    4. 4 min 48 sec

  1. View Hint View Answer Discuss In Forum

    Speed in m/sec = Speed in km/hr x 5/18

    Correct Option: D

    Rohit's speed = 10 Km/hr = (10 x 5/18) m/sec = 50/18 m/sec

    Time taken to cover 800 m = (800 / (50/18) ) sec
    = (800 x 18/50) sec = 288 sec = 4 min 48 sec


  1. A plane flies along the four sides of a square field at a speed of 200, 400, 600 and 800 km/hr. Then find the average speed of plane around the square field.
    1. 394
    2. 400
    3. 414
    4. 384

  1. View Hint View Answer Discuss In Forum

    Let the side of the square field be x and the speed of plane be y

    x/200 + x/400 + x/600 + x/800 = 4x/y

    Correct Option: D

    Let the side of the square field be x and the average speed of plane be y

    x/200 + x/400 + x/600 + x/800 = 4x/y
    ⇒ 25x/2400 = 4x/y
    ⇒ y =384

    ∴ Average speed is 384 km/hr


  1. Laxman has to cover a distance of 6 km in 45 minutes . If he cover one half of the distance in 2/3rd time . what should be his speed to cover the remaining distance in the remaining time?
    1. 12 km/hr.
    2. 16 km/hr.
    3. 3 km/hr.
    4. 8 km/hr.

  1. View Hint View Answer Discuss In Forum

    ∵ Time left = (1/3 X 45/60) hr.
    = 1/4 hr.
    Distance left = 3km

    ∴ speed required = [3 / (1/4) ] km/hr.

    Correct Option: C

    ∵ Time left = (1/3 X 45/60) hr.
    = 1/4 hr.
    Distance left = 3km

    ∴ speed required = [3 / (1/4) ] km/hr.
    = 3 x 4
    =12km/hr .