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Two trains are running at 40 km/hr and 20 km/hr respectively in the same direction. Fast train completely passes a man sitting in the slower train in 5 seconds. What is the length of the fast train ?

  • 2779
  • 2879
  • 2979
  • 3079

Answer: Option A

Explanation:

As Trains are moving in same direction,
So, Relative Speed = 40-20 = 20 kmph
= 20*(5/18) = 50/9 m/sec

Length of Train= Speed * Time

Length=509∗5=2509=2779

Similar Questions :

1. Two trains of equal length are running on parallel lines in the same direction at 46 km/hr and 36 km/hr. The faster train passes the slower train in 36 seconds. The length of each train is ?

  • 40 meter
  • 45 meter
  • 50 meter
  • 55 meter

Answer: Option C

Explanation:

Let the length of each train is x meter
Distance will be x+x = 2x

Relative Speed = 46-36 = 10 km/hr
= 10*(5/18) = 25/9 m/sec

Distance = Speed*Time

2x=259∗362x=100=>x=50


So length of both the trains are 50 meters

2. How long does a train 110 meters long running at the speed of 72 km/hour take to cross a bridge 132 meters in length ?

  • 15 seconds
  • 12.1 seconds
  • 10 seconds
  • 8.1 seconds

Answer: Option B

Explanation:

Speed = 72 km/hour = 72*(5/18) m/sec
= 20 m/sec

Total distance to be covered = 110+132 = 142 meters

Time = Distance/Speed
= 242/20 = 12.1 seconds

3. In what time will a train 100 meters long cross an electric pole, if its speed is 144 km/hr

  • 5 seconds
  • 4.5 seconds
  • 3 seconds
  • 2.5 seconds

Answer: Option D

Explanation:

First convert speed into m/sec

Speed = 144*(5/18) = 40 m/sec

Time = Distance/speed
= 100/40 = 2.5 seconds

4. A train speeds past a pole in 15 seconds and a platform 100 meter long in 25 seconds. What is length of the train ?

  • 140 meter
  • 145 meter
  • 150 meter
  • 155 meter

Answer: Option C

Explanation:

Let the length of the train is x meter and Speed of the train is y meter/second
Then x/y = 15 [because distance/speed = time]
=> y = 15/x

=>x+10025=x15x=150 meters



So length of the train is 150 meters

5. A train is 360 meter long is running at a speed of 45 km/hour. In what time will it pass a bridge of 140 meter length.

  • 20 seconds
  • 30 seconds
  • 40 seconds
  • 50 seconds

Answer: Option C

Explanation:

Speed = 45 Km/hr = 45*(5/18) m/sec
= 25/2 m/sec
Total distance = 360+140 = 500 meter

Time = Distance/speed
=500∗225=40seconds

Read more from - Problems on Trains Questions Answers
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