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:
109 comments Page 4 of 11.
Pavan said:
2 decades ago
Hi arun great job.
Raj said:
2 decades ago
Use simple formula :
1)if 2 things acts in same direction( may be 2 trains or train&jogger)
time they meet t=(x+y)/(u-v)
where x,y-distance of trains or something
u,v-speed's in mps.
2)if 2 things acts in opposite direction:
time they meet t=(x+y)/(u+v)
1)if 2 things acts in same direction( may be 2 trains or train&jogger)
time they meet t=(x+y)/(u-v)
where x,y-distance of trains or something
u,v-speed's in mps.
2)if 2 things acts in opposite direction:
time they meet t=(x+y)/(u+v)
Ambika said:
2 decades ago
When & why we find relative speed. Plz explain to me I forget
Arulmozhi said:
2 decades ago
When the two trains moving towards or in opposite direction that time we find relative speed.
Am I correct?.
Am I correct?.
Anjan said:
2 decades ago
Hi frds. Well I have a doubt. How can a slower train ever cross the faster one?.
Kiran said:
2 decades ago
But can you tell me when we subtract (1.10km-0.9km)it becomes(0.2km)
then how can it becomes 2 km. Please explain.
then how can it becomes 2 km. Please explain.
Hadiyal Jignesh said:
2 decades ago
Kiran There is no subtraction in formula we are adding the 1.10 km + 0.9 km = 2 km
right?
right?
Sathish said:
2 decades ago
How to change 2km = 2000m ?
Sundar said:
2 decades ago
@Sathish
1 km = 1000 m
2 km = 1000 x 2 = 2000m.
1 km = 1000 m
2 km = 1000 x 2 = 2000m.
Himanshu said:
2 decades ago
If the question be:
The time taken by the faster train to cross the slower train in seconds is. ?
What would be the working and answer?
The time taken by the faster train to cross the slower train in seconds is. ?
What would be the working and answer?
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