Discussion
Home ‣ Aptitude ‣ Problems on Trains Comments
- Question
Two trains started at the same time, one from A to B and the other from B to A . If they arrived at B and A respectively 4 hours and 9 hours after they passed each other the ratio of the speeds of the two trains was
Options- A. 2:1
- B. 3:2
- C. 4:3
- D. 5:4
- Correct Answer
- 3:2
ExplanationNote : If two trains (or bodies) start at the same time from points A and B towards each other and after crossing they take a and b sec in reaching B and A respectively, then: (A's speed) : (B's speed) = (b : a)
Therefore, Ratio of the speeds of two trains = = 3 : 2
- 1. A train of length 110 meter is running at a speed of 60 kmph. In what time, it will pass a man who is running at 6 kmph in the direction opposite to that in which the train is going?
Options- A. 10
- B. 8
- C. 6
- D. 4 Discuss
- 2. A man sitting in a train which is traveling at 50 kmph observes that a goods train, traveling in opposite direction, takes 9 seconds to pass him. If the goods train is 280 m long, find its speed.?
Options- A. 60
- B. 62
- C. 64
- D. 65 Discuss
- 3. What is the unit digit of (217)413 × (819)547 × (414)624 × (342)812?
Options- A. 2
- B. 4
- C. 6
- D. 8 Discuss
- 4. How many 100 digit positive number are there?
Options- A. 9 × 1099
- B. 9 × 10100
- C. 10100
- D. 11 × 1098 Discuss
- 5. What is the unit digit of the sum of first 111 whole numbers?
Options- A. 4
- B. 6
- C. 5
- D. 0 Discuss
- 6. A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is :
Options- A. 9.5 km/hr
- B. 10 km/hr
- C. 10.5 km/hr
- D. 11 km/hr Discuss
- 7. Two cogged wheels of which one has 32 cogs and other 54 cogs, work into each other. If the latter turns 80 times in three quarters of a minute, how often does the other turn in 8 seconds?
Options- A. 48
- B. 24
- C. 38
- D. 36 Discuss
- 8. Two trains are running in opposite directions in the same speed. The length of each train is 120 meter. If they cross each other in 12 seconds, the speed of each train (in km/hr) is
Options- A. 42
- B. 36
- C. 28
- D. 20 Discuss
- 9. A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20 seconds respectively. What is the speed of the train ?
Options- A. 69.5 km/hr
- B. 70 km/hr
- C. 79 km/hr
- D. 79.2 km/hr Discuss
- 10. A train moves with a speed of 108 kmph. Its speed in metres per second is :
Options- A. 10.8
- B. 18
- C. 30
- D. 38.8 Discuss
Problems on Trains
Search Results
Correct Answer: 6
Correct Answer: 62
Explanation:
Relative speed =280/9 m / sec = (280/9*18/5) kmph = 112 kmph.
Speed of goods train = (112 - 50) kmph = 62 kmph.
Correct Answer: 8
Correct Answer: 9 × 1099
Correct Answer: 5
Correct Answer: 10 km/hr
Explanation:
Man's rate in still water = (15 - 2.5) km/hr = 12.5 km/hr.
Therefore, Man's rate against the current = (12.5 - 2.5) = 10 km/hr.
Correct Answer: 24
Correct Answer: 36
Explanation:
Distance covered = 120+120 = 240 m
Time = 12 s
Let the speed of each train = v. Then relative speed = v + v = 2v
2v = distance/time = 240/12 = 20 m/s
Speed of each train = v = 20/2 = 10 m/s
= 10 × 36/10 km/hr = 36 km/hr
Correct Answer: 79.2 km/hr
Correct Answer: 30
Explanation:
108 kmph = 108*[5/18] m/sec = 30 m / s.
Comments
There are no comments.More in Aptitude:
Programming
Copyright ©CuriousTab. All rights reserved.