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- Question
- A train 540 m long is running with a speed of 72 km/hr. In what time it pass a tunnel 160 m long?
Options- A. 40 sec
- B. 30 sec
- C. 35 sec
- D. 42 sec
- Correct Answer
- 35 sec
Explanation? Speed of the train = 72 km/hr = 72 x (5/18) = 20 m/sec.
Sum of the length of the train and tunnel = 540 + 160 = 700 metres.
? Required time taken to pass the tunnel = Time taken to cover 700 metres at 20 m/sec.
= 700/20
= 35 sec. - 1. A column of men, extending 250 metres in length takes one hour to march through a street at the rate of 50 paces a minute, each pace being 75 cm. Find the length of the street?
Options- A. 2 km
- B. 1 km
- C. 1.5 km
- D. 2.5 km Discuss
- 2. Find the length of a bridge, which a train 130 metres long travelling at 45 km an hour, can cross in 30 seconds?
Options- A. 240 m
- B. 235 m
- C. 250 m
- D. 245 m Discuss
- 3. A train 160 metres long passes a standing man in 18 seconds. What is the speed of the train?
Options- A. 28 km/hr
- B. 36 km/hr
- C. 32 km/hr
- D. None of these Discuss
- 4. A train travelling at 30 km an hour took 13 1/ 2 sec in passing a certain point. Find the length of the train?
Options- A. 113 metres
- B. 112 metres
- C. 112.5 metres
- D. None of these Discuss
- 5. How long will a train 130 m long travelling at 40 km an hour, take to pass a kilometer stone?
Options- A. 12 sec
- B. 11.7 sec
- C. 11.2 sec
- D. 11 sec Discuss
- 6. A train 200 m long is running with a speed of 72 km/hr. In what time will it pass a platform 160 m long?
Options- A. 18 sec
- B. 21 sec
- C. 15 sec
- D. 20 sec Discuss
- 7. A train 150 m long passes a telegraphs post in 12 seconds. Find in what time, it will pass a bridge 250 m long?
Options- A. 32 sec
- B. 36 sec
- C. 25 sec
- D. 24 sec Discuss
- 8. A train 280 m long is moving at a speed of 60 km/hr. The time taken by the train to cross a platform 220 m long is?
Options- A. 20 sec
- B. 25 sec
- C. 30 sec
- D. 35 sec Discuss
- 9. A train 700 m long is running at the speed of 72 km/hr. If it cross a tunnel in 1 minute, then the length of the tunnel?
Options- A. 700 m
- B. 600 m
- C. 550 m
- D. 500 m Discuss
- 10. A train with 90 km/hr crosses a bridge in 36 seconds. Another train 100 m shorter crosses the same bridge at 45 km/hr. Find the time taken by the second train to cross the bridge?
Options- A. 64 sec
- B. 60 sec
- C. 72 sec
- D. 1 hr Discuss
Problems on Trains
Search Results
Correct Answer: 2 km
Explanation:
Speed of the column of men = (50 x 75) / (100 x 60) = 5/8 m/sec.
Let the length of the street be L metres
? (L + 250) = (60 x 60 x 5) / 8 = 2250 metres
? L = (2250 - 250) m
? L = 2000 m = 2 km.
Correct Answer: 245 m
Explanation:
Speed of the train = 45 km/hr = 45 x (5/18) = 25/2 m/sec
Let the length of the bridge be L metres
? (L + 130) / (25/2) = 30
? L + 130 = 15 x 25
L = 375 - 130 = 245 metres
Correct Answer: 32 km/hr
Explanation:
Speed of the train = (160/18) x (18/5) = 32 km/hr.
Correct Answer: 112.5 metres
Explanation:
Speed = 30 km/hr = 30 x (5/18) = 25/3 m/sec.
? Length of the train = (25/3) x (27/2)
= 225/2 = 1121/2 metres
Correct Answer: 11.7 sec
Explanation:
Total distance = 130 m = 0.13 km
Speed of the train = 40 km /hr
Time taken = 0.13/40 hr = (0.13 x 60 x 60) / 40 = 11.7 sec.
Correct Answer: 18 sec
Explanation:
Distance covered = 200 + 160 = 360.
Speed of train = 72 km = 72 x (5/18) = 20 sec.
Time = 360 / 20 = 18 sec.
Correct Answer: 32 sec
Explanation:
? Speed of the train = 150/12 m/sec.
Required time taken to cross the bridge = [(150 + 250) x (12/150)] = 32 sec.
Correct Answer: 30 sec
Explanation:
Distance covered = 220 + 280 = 500 = 0.5 km
Speed = 60 kmph.
Time taken = 0.5 / 60 hr = (0.5 x 60 x 60)/60 sec
= 30 sec
Correct Answer: 500 m
Explanation:
length of tunnel + length of train = distances covered by train in 1 min
? length of tunnel + 700 = 72/60 km = 1.2 km = 1200 m
? length of tunnel = 1200 - 700 = 500 m
Correct Answer: 64 sec
Explanation:
Speed of the first train = 90 km/hr = 90 x (5/18) m/sec. = 25 m/sec
Let the length of the train and bridge be L metre.
? L = 25 x 36 = 900 m.....(1)
Again Speed of the second train = 45 km/hr = 45 x (5/18) = 25/2 m/sec.
Now, putting the value from eqn. (1) we have
Time taken = (900 - 100) x 2/25 = 800 x 2/25 = 64 sec
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