Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 9)
9.
Two trains are moving in opposite directions @ 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the faster train in seconds is:
Answer: Option
Explanation:
Relative speed = (60+ 90) km/hr
| = |  |
150 x | 5 |  m/sec |
| 18 |
| = | |
125 | m/sec. |
| 3 |
Distance covered = (1.10 + 0.9) km = 2 km = 2000 m.
| Required time = | |
2000 x | 3 | sec = 48 sec. |
| 125 |
Discussion:
107 comments Page 6 of 11.
Ajit vishwakarma said:
1 decade ago
What do you mine time taken by the slower train to cross the faster train?
Avinash Upadhyay said:
1 decade ago
@Divyan, here we are converting the speed into meter/sec from km/hr .
(1km = 1000m
1hr = 3600sec
m/sec = 1000/3600 = 5/18.)
150*25/3 = 125/3.
And relative speed comes into picture when two given objects in the questions are in motion.
(1km = 1000m
1hr = 3600sec
m/sec = 1000/3600 = 5/18.)
150*25/3 = 125/3.
And relative speed comes into picture when two given objects in the questions are in motion.
Divyan said:
1 decade ago
Why we are not simplifying 125/3? Please help me guys.
Aasif Khan said:
1 decade ago
This is due, when we calculate time= distance/speed,
Speed is 125/3 m/sec. Therefore when we divide 2000m with 125/3 it becomes 2000 multiply by 3/125.
Speed is 125/3 m/sec. Therefore when we divide 2000m with 125/3 it becomes 2000 multiply by 3/125.
Bismillah khan said:
1 decade ago
No need to convert Km to m, conversion is due to hr to sec because answer is in sec.
Ragi said:
1 decade ago
For what purpose we are converting the kilometer into meter? can't we solve this problem with length 2km.
Ram said:
1 decade ago
They are starting at two different points and moving in opposite direction. They are not starting at the same point.
Subhransu said:
1 decade ago
Friend take a live example to make it understand when your going towards your home on the left side of the road and one of your friend returning from your home on your right side of the same road.
Definitely you will cross each other like this 2 train traveling in opposite direction they can cross each other.
Definitely you will cross each other like this 2 train traveling in opposite direction they can cross each other.
Sonu kumar said:
1 decade ago
When two train moving in opposite direction then how it possible they cross each other?
Virat said:
1 decade ago
Please explain me how can we find 125/3?
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