Aptitude - Problems on Trains - Discussion
Discussion Forum : Problems on Trains - General Questions (Q.No. 1)
1.
A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?
Answer: Option
Explanation:
| Speed = |  |
60 x | 5 |  m/sec |
= | |
50 | m/sec. |
| 18 | 3 |
Length of the train = (Speed x Time).
 Length of the train = |
|
50 | x 9 | m = 150 m. |
| 3 |
Discussion:
587 comments Page 13 of 59.
Bahauddin said:
6 years ago
Some thing is missing in the question and solution because if train crosses the pole means train will has to cross the extra length as much the length of train.
Jayanthi said:
1 decade ago
Lets take mnthy salry to be x;
then ,
x-15x/100+55x/100=12750;
x-14x/20=12750;
6x/20=12750;
x=(12750)20/6
x=42,5000;
monthly salry is Rs.42,500
then ,
x-15x/100+55x/100=12750;
x-14x/20=12750;
6x/20=12750;
x=(12750)20/6
x=42,5000;
monthly salry is Rs.42,500
Farhat said:
1 decade ago
Speed = 60 km/hr.
Time = 9 sec.
Distance = ?
Then, 1 km = 1000 m.
1 hr = 3600 sec.
Because we are to find the distance in metre/sec.
60000*9/3600 = 15 m.
Time = 9 sec.
Distance = ?
Then, 1 km = 1000 m.
1 hr = 3600 sec.
Because we are to find the distance in metre/sec.
60000*9/3600 = 15 m.
Vivek said:
7 years ago
We calculated the train length with reference to the pole. But what about the length of the pole. Doesn't it come to picture here?
Please, anyone, clarify it.
Please, anyone, clarify it.
Pradeep said:
1 decade ago
Distance = speed*time(50/2*9 = 150) m.
So, 150 m is distance traveled by the train, length of the train can be lower than distance. So can't say 150 m exact.
So, 150 m is distance traveled by the train, length of the train can be lower than distance. So can't say 150 m exact.
Nagesh said:
1 decade ago
Distance = speed*time(50/2*9 = 150)m.
So, 150 m is distance traveled by the train, length of the train can be lower than distance. So can't say 150 m exact.
So, 150 m is distance traveled by the train, length of the train can be lower than distance. So can't say 150 m exact.
Rubiya said:
1 decade ago
If train takes 20 seconds means taking more time to cross the pole. It means length of train is more 20*50/3 is 333.3. Therefore here train length increases.
KEITH said:
1 decade ago
So when the questions says find the length of the train, in such case we have to find the distance i.e. by using the distance formula.
D=S*T.
S=D/T.
T=D/S.
D=S*T.
S=D/T.
T=D/S.
Datta pawar said:
9 years ago
First convert value:
60km = 60000mtr.
1 hour = 3600sec.
Calculation.
60000/3600 = 16.666 mtr/sec (this value for only one meter).
So 9 * 16.666 = 150mtr.
60km = 60000mtr.
1 hour = 3600sec.
Calculation.
60000/3600 = 16.666 mtr/sec (this value for only one meter).
So 9 * 16.666 = 150mtr.
Priyanka padhi said:
10 years ago
Thanks @Sundar. That's was a very nice explanation. For those who are not strong in this section, this is the best way to make them easily understandable.
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