Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 15)
15.
A train 110 metres long is running with a speed of 60 kmph. In what time will it pass a man who is running at 6 kmph in the direction opposite to that in which the train is going?
Answer: Option
Explanation:
Speed of train relative to man = (60 + 6) km/hr = 66 km/hr.
| = |  |
66 x | 5 |  m/sec |
| 18 |
| = | |
55 | m/sec. |
| 3 |
 Time taken to pass the man = |
|
110 x | 3 | sec = 6 sec. |
| 55 |
Discussion:
36 comments Page 4 of 4.
Shanmu said:
2 decades ago
1 km=1000m
1 hour=3600 seconds
to convert from km/hour into m/sec
1000/3600=5/18 m/sec
got it !
1 hour=3600 seconds
to convert from km/hour into m/sec
1000/3600=5/18 m/sec
got it !
Chellem said:
2 decades ago
How it comes 5/18? anyone please reply.
Priyavel said:
2 decades ago
hi friend
tarun
step 1) opposite direction so we add it(60+6)
step 2) we convert km/hour into m/sec so we multiply by 5/18
step 3)speed=distance/time
spep 4) time=distance/speed
i think now u get it clearly.
tarun
step 1) opposite direction so we add it(60+6)
step 2) we convert km/hour into m/sec so we multiply by 5/18
step 3)speed=distance/time
spep 4) time=distance/speed
i think now u get it clearly.
Tarun said:
2 decades ago
Hey ramesh,
If you know the derivation please let us know.
If you know the derivation please let us know.
(1)
Ramesh karthick said:
2 decades ago
@Praba.
Your answer is wrong. How will you said diff is applicable. Because speed opposite direction. So additive is applicable.
Your answer is wrong. How will you said diff is applicable. Because speed opposite direction. So additive is applicable.
(1)
RPrabha said:
2 decades ago
Additive speeds are only valid for the objects moving in th esame direction. Here only difference is applcable. so the answer would be 7 sec approx.
(1)
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