Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 11)
11.
A 270 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?
Answer: Option
Explanation:
Relative speed = (120 + 80) km/hr
| = |  |
200 x | 5 |  m/sec |
| 18 |
| = | |
500 | m/sec. |
| 9 |
Let the length of the other train be x metres.
| Then, | x + 270 | = | 500 |
| 9 | 9 |
x + 270 = 500
x = 230.
Discussion:
66 comments Page 2 of 7.
Sushma said:
1 decade ago
As given: 120+80=200
200*5/18=500/9
Let the length of other train be X
then X+270/9=500/9
cross multiply, u vl get
9X + 2430= 4500
9X=2070.
.'. X=2070/9
x=230
200*5/18=500/9
Let the length of other train be X
then X+270/9=500/9
cross multiply, u vl get
9X + 2430= 4500
9X=2070.
.'. X=2070/9
x=230
Kadoliya jitendra said:
1 decade ago
What is kmph?
Krishna said:
1 decade ago
The speed & time of the other so we can directly get the length of the other train.
Amar said:
1 decade ago
kmph means kilometer per hour(Km/h).
Amudha said:
1 decade ago
To find length of one train why we are calculating relative speed?
Aswin said:
1 decade ago
Please let me know, where 100/3 comes from?
Sabira said:
1 decade ago
Speed = 120+80 = 200 km/hr.
200* (5/18) = 500/9m/sec.
Total length = 500/9*9.
= 500 m.
500 - 270 = 230 is the other train length.
200* (5/18) = 500/9m/sec.
Total length = 500/9*9.
= 500 m.
500 - 270 = 230 is the other train length.
Kd kannan said:
1 decade ago
To aswin:
100/3 and 120 (5/18).
Two values are equal.
It is another form of 33.3.
100/3 and 120 (5/18).
Two values are equal.
It is another form of 33.3.
Santosh adithya said:
1 decade ago
Why there is (x+270)/9 acc. to formula (270+x)/500/9 = 9 right?
Moni said:
1 decade ago
Relative speed should be minus from each train speed because the direction is opposite, isn't it so?
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