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- Question
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
- Correct Answer
- 62
ExplanationRelative speed =280/9 m / sec = (280/9*18/5) kmph = 112 kmph.
Speed of goods train = (112 - 50) kmph = 62 kmph.
- 1. What is the unit digit of (217)413 × (819)547 × (414)624 × (342)812?
Options- A. 2
- B. 4
- C. 6
- D. 8 Discuss
- 2. How many 100 digit positive number are there?
Options- A. 9 × 1099
- B. 9 × 10100
- C. 10100
- D. 11 × 1098 Discuss
- 3. What is the unit digit of the sum of first 111 whole numbers?
Options- A. 4
- B. 6
- C. 5
- D. 0 Discuss
- 4. Convert decimal number 101 to binary.
Options- A. 1100101
- B. 1100111
- C. 1101001
- D. 1101011 Discuss
- 5. The first and last terms of an arithmetic progression are 23 and 42. What is the sum of the series if it has 14 terms?
Options- A. 91
- B. -133
- C. 93
- D. 133 Discuss
- 6. 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
- 7. 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 Discuss
- 8. 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
- 9. 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
- 10. 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
Problems on Trains
Search Results
Correct Answer: 8
Correct Answer: 9 × 1099
Correct Answer: 5
Correct Answer: 1100101
Correct Answer: -133
Correct Answer: 6
Correct Answer: 3:2
Explanation:
Note : 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
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
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