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A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long ??
Last Post 23 May 2014 02:33 AM by philip. 8 Replies.
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raj
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Posts:167

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25 Apr 2012 08:10 PM
    A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?
    ncullen12
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    Posts:1

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    26 Apr 2012 10:15 AM
    The train is traveling at 4500 m/hr. At t=0, the train enters the bridge. At t=1.867 minutes, the train leaves passes the bridge with a remaining 220 m of train to enter the bridge still. At t=4.8 minutes, the last part of the train enters the bridge. At t=6.67 minutes (or 0.11 hours), the remaining portion of the train passes the bridge.
    Jrichey9
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    30 Apr 2012 05:15 AM
    At t=0, the the front of the train is at the beginning of the bride. At t=x, the rear of the train is at the end of the bridge. The total distance traveled would be equivalent to the length of the train + the length of the bridge = 500m or .5km. Using the equation Distance = Time x Velocity...you get the equation .5km = Time x 45km/hr. That simplifies to Time = 1/90 of an hour which then equals to 40 seconds.
    shekharsaad
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    13 May 2012 09:38 PM
    first take all dimentios in meter
    45km/hr= 45x1000/3600
    = 12.5 m/s
    distance require to pass a train
    =bridge length + train length
    =140+360
    =500m

    now time (t) taken to pass train
    =distance/speed
    =500/12.5
    =40 sec.
    alastair
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    Posts:132

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    23 Jan 2014 10:45 PM
    60 seconds
    james
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    Posts:125

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    26 Jan 2014 11:02 PM
    50 sec
    richie
    Basic Member
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    Posts:171

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    24 Apr 2014 11:50 PM
    20 mins
    hamza
    New Member
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    Posts:62

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    20 May 2014 11:28 PM
    30 mins
    philip
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    Posts:118

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    23 May 2014 02:33 AM
    10 mins
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