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PS : TRAIN (m09q09) [#permalink]
26 Oct 2008, 23:59

1

This post received KUDOS

The train consists of 6 carriages, 20 meters long each. The gap between the carriages is 1 meter. If the train is moving at a constant speed of 60 kmh, how much time will it take the train to run through a 1 kilometer tunnel?

The train consists of 6 carriages, 20 meters long each. The gap between the carriages is 1 meter. If the train is moving at a constant speed of 60 kmh, how much time will it take the train to run through a 1 kilometer tunnel?

Train Length = 6*20 + 5*1 = 125m Total Distance = Tunnel+Train = 1000m+125m = 1125 m = 1 1/8 Km Speed = 60KmpH = 1 Km/min So, it will take 1 1/8 min to travel the total distance.

The train consists of 6 carriages, 20 meters long each. The gap between the carriages is 1 meter. If the train is moving at a constant speed of 60 kmh, how much time will it take the train to run through a 1 kilometer tunnel?

Length of the train = 6*20+5*1=125 meters Speed of the train = 60000/60 meters/min = 1000 meters/min Length of the tunnel = 1000 meters Total Distance = 1000+125=1125 meters

Distance = Time*Speed 1125 = Time * 1000 Time = \frac{1125}{1000} = 1.125 = 1+ \frac{125}{1000} = 1+ \frac{1}{8}= 1\frac{1}{8}

The train consists of 6 carriages, 20 meters long each. The gap between the carriages is 1 meter. If the train is moving at a constant speed of 60 kmh, how much time will it take the train to run through a 1 kilometer tunnel?

simple, but calculation is required... A is the answer

clue to calculate it for 60km in 1 hr....and 125m long train to cross over 1km tunner will take another A mins... so calculate it for 1m - how much time from 60kmp and then apply for 125m length of train...n add 1+ the new value which gives A
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Regards, Harsha

Note: Give me kudos if my approach is right , else help me understand where i am missing.. I want to bell the GMAT Cat

Length of train = 20+1+20+1+20+1+20+1+20+1+20 = 125 meters Speed of train = 1 km/minutes Tunnel Length = 1 km so train has to travel 1 km + its own length = 1.125 km

1.125 minutes require to cross the tunnel i.e. 1(1/8)

A for me too Length is 125m Total distance travelled is length of tunnel + length of train = 1.125k To travel 60 km, train takes 60min To travel 1.125m, train takes 1.125 min. Hence A

The train consists of 6 carriages, 20 meters long each. The gap between the carriages is 1 meter. If the train is moving at a constant speed of 60 kmh, how much time will it take the train to run through a 1 kilometer tunnel?

The length of the train is 6*20 plus five 1 meter gaps, so it's 6*20+5=125 meters; The length that should be covered by train is 1+0.125=1.125 kilometers;

Time=\frac{Distance}{Rate}=\frac{1.125}{60} hours or \frac{1.125}{60}*60=1.125=1\frac{1}{8} minutes.

The train consists of 6 carriages, 20 meters long each. The gap between the carriages is 1 meter. If the train is moving at a constant speed of 60 kmh, how much time will it take the train to run through a 1 kilometer tunnel?

Net length of the train = 125m Length of train = 1000m

Net distance = train length + train's own leangth = 1125 m

The train travels 60 km in 1 hr => to cover 1125 m it takes 1.125 min = 1 1/8 Hence A

The train consists of 6 carriages, 20 meters long each. The gap between the carriages is 1 meter. If the train is moving at a constant speed of 60 kmh, how much time will it take the train to run through a 1 kilometer tunnel?

Total distance to cover = length of train + length of tunnel = (20*6 + 5)/1000 + 1 Km = 1.125 km 1 km is traveled in 60 min --> 1.125 km is traveled in 1.125 min = 1 + 1/8 min

We need to consider whole length of the train. the moment it enters the cave till last carriage leave the cave that will add another 0.125. Rest iOS just applying the formula.
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