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Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time which they take to cross each other, is

  • 9.8 seconds
  • 10.8 seconds
  • 11.8 seconds
  • 12.8 seconds

Answer: Option B

Explanation:

Relative Speed = 60+40 = 100 kmph
= 100*(5/18) = 250/9 m/sec

Distance = 140+160 = 300 meters

Time = Distance/Speed

300∗9250=545=10.8 seconds



So the time trains will take to cross each other will be 10.8 seconds

Similar Questions :

1. 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

2. A 300 meter long train crosses a platform in 39 seconds while it crosses a signal pole in 18 seconds. What is the length of the platform.

  • 310 meter
  • 335 meter
  • 345 meter
  • 350 meter

Answer: Option D

Explanation:

Speed = Distance/time = 300/18 = 50/3 m/sec

Let the length of the platform be x meters
then
Distance=Speed∗Timex+300=503∗39=>3(x+300)=1950=>x=350 meters

3. A train running at the speed of 60 km/hr crosses a pole in 9 seconds. Find the length of the train.

  • 150 meter
  • 145 meter
  • 140 meter
  • 135 meter

Answer: Option A

Explanation:

Speed = 60*(5/18) m/sec = 50/3 m/sec

Length of Train(Distance) = Speed * Time

=503∗9=150meter

4. A train is running with a speed of 60 kmph and its length is 110 metres. Calculate the time by which it will pass a man running opposite with speed of 6 kmph.

  • 2 second
  • 4 second
  • 6 second
  • 8 second

Answer: Option C

Explanation:

From the given question,
we will first calculate the speed of train relative to man,
=> ( 60 + 6 ) = 66 km/hr ( we added 6 because man is running opposite )
Convert it in metre/second
=66×518=553m/secTime it will take to pass man =110×355=6 seconds



5. A jogger running at 9 kmph alongside a railway track is 240 metres ahead of the engine of a 120 metre long train running at 45 kmph in the same direction. In how much time will the train pass the jogger ?

  • 30 seconds
  • 32 seconds
  • 34 seconds
  • 36 seconds

Answer: Option D

Explanation:

Speed of train relative to jogger = (45-9) = 36 kmph
= 36*(5/18) = 10 m/sec

Distance to cover = 240 + 120 = 360 metres

Time = Distance/Speed
So,
Time=36010=36 Seconds

Read more from - Problems on Trains Questions Answers
Post a comment

  • shiva 11 years ago

    small mistake in this problem is...its 54/5=10.8 not 54/4

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