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A man sees a train passing over a bridge 1 km long. The length of the train is half that of the bridge. If the train clears the bridge in 2 minutes, the speed of the train is
A. 30 km/hr
B. 40 km/hr
C. 45 km/hr
D. 55 km/hr

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A man sees a train passing over a bridge 1 km long. The length of the train is half that of the bridge. If the train clears the bridge in 2 minutes, the speed of the train is
A. 30 km/hr
B. 40 km/hr
C. 45 km/hr
D. 55 km/hr
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10 Answers

  1. d = 1000 + 500 (distance to drive in meter. bridge + train size)
    t = 120 (2 minutes to second)
    s = d / t (12.5 m/s)
    convert m/s to km/h = x 3.6
    12.5 x 3.6 = 45 km/h

    the train drive 45 km/h

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  2. 30km/hr
    because train passed 1km total distance starting bridge to ending take total time is 2 minitues
    so that=1/0.033=30.30

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  3. Total distance= 1km+0.5 km=1.5km=1500m
    Time taken =2min=120seconds
    Speed=distance/time=1500/120=12.5m/s
    Speed( in km/hr)=12.5*18/5=45

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  4. In two minutes trains travels 1km
    In one minute it will travels0.5km
    1 hour = 60 minutes
    Therefore it’s speed per hour is 0.5*60
    i.e 30 km/h

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  5. Total distance covered by train = 1km + 0.5km =1.5km
    Time is 2minutes, this convert to hour is 2/60 = 0.033

    speed =distance/time
    1.5/0.033
    = 45.45km/hr

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  6. Total distance=1+(1/2)=3/2
    Time in hours=60/2
    Speed of train=3/2×(60/2)=45km/hr

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