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:
626 comments Page 7 of 63.
Mahendra Budha said:
3 years ago
To find the length of the train, we can use the formula: length = (speed × time).
Given the speed is 60 km/hr and it crosses a pole in 9 seconds.
The length of the train would be 60 km/hr × (9 seconds ÷ 3600 seconds) = 0.15 km or 150 meters.
Given the speed is 60 km/hr and it crosses a pole in 9 seconds.
The length of the train would be 60 km/hr × (9 seconds ÷ 3600 seconds) = 0.15 km or 150 meters.
(52)
Apurva said:
1 decade ago
SOLUTION:
60 km/hr.
1k m = 1000 m.
1 hr = 60 min.
Therefore 60km/60min.
i.e. 1 km = 1 min.
1 min = 60 sec.
60 km/hr = (60*1000)/60 m/min.
60 km/hr = (60*1000)/(60*60) m/sec.
= 1000/60.
16.67 m/sec.
Distance in 9 sec = 16.67*9 = 150 m.
60 km/hr.
1k m = 1000 m.
1 hr = 60 min.
Therefore 60km/60min.
i.e. 1 km = 1 min.
1 min = 60 sec.
60 km/hr = (60*1000)/60 m/min.
60 km/hr = (60*1000)/(60*60) m/sec.
= 1000/60.
16.67 m/sec.
Distance in 9 sec = 16.67*9 = 150 m.
G hari krishna said:
9 years ago
You all converted km --> m. Why don't you convert seconds into hours?
Then S=d/t,
Then D=s*t.
But t=9 sec.
If we convert it into hours form we will get 1/400.
Then d=60*1/400.
Is it correct method. Let me explain in this way guys.
Then S=d/t,
Then D=s*t.
But t=9 sec.
If we convert it into hours form we will get 1/400.
Then d=60*1/400.
Is it correct method. Let me explain in this way guys.
Simon Newfield said:
1 decade ago
@Peter.
60x5/18 = 50/3 because 60x5/18 = 16.
66666666666667 Now we must convert this to a whole number which is 50. To get 50 you must multiply 16.66666666666667 with 3.
So you write it down as 50/3 because 50/3 equals 16.66666666666667.
60x5/18 = 50/3 because 60x5/18 = 16.
66666666666667 Now we must convert this to a whole number which is 50. To get 50 you must multiply 16.66666666666667 with 3.
So you write it down as 50/3 because 50/3 equals 16.66666666666667.
Divya said:
1 decade ago
Salary problem
Let's take salary amount as X.
she spends 15% of X on policy=15X/100
55% of X on shopping &house expe=55X/100
rem of salary=12750
so,X-(15X/100)-(55X/100)=12750
30X=1275000
X=42500
Let's take salary amount as X.
she spends 15% of X on policy=15X/100
55% of X on shopping &house expe=55X/100
rem of salary=12750
so,X-(15X/100)-(55X/100)=12750
30X=1275000
X=42500
Suresh said:
1 decade ago
Imagine the pole as a car moving on the train(road) which has a distance of 150m. If the pole(car) takes 9 sec to complete 150m, then what is the speed?
speed of the pole(car)=150m/9sec
= 16.67ms-1
=16.67*(18/5)km/hr
=60km/hr
speed of the pole(car)=150m/9sec
= 16.67ms-1
=16.67*(18/5)km/hr
=60km/hr
Hifzur said:
1 decade ago
Its simple no need of going that 5/18 it wil give confusion.
Convert 60 km into meter i.e 60000m.
Now speed is 60000m/hr... convert it into per second.
i.e 60000/(60*60)=16.66
As we know length=(speed*time)
:.16.66*9 = 150.
Convert 60 km into meter i.e 60000m.
Now speed is 60000m/hr... convert it into per second.
i.e 60000/(60*60)=16.66
As we know length=(speed*time)
:.16.66*9 = 150.
Nicky said:
8 years ago
Hi Raneesh,
You have explained in very clear but I have a doubt =( 60 *5/18) * 9, how did *5/18.
Speed = Distance/Time.
Distance = Speed * Time.
Or lenght = Speed * Time .
=( 60 *5/18) * 9,
= 50/3 * 9,
= 50 * 3 ,
= 150 meter.
You have explained in very clear but I have a doubt =( 60 *5/18) * 9, how did *5/18.
Speed = Distance/Time.
Distance = Speed * Time.
Or lenght = Speed * Time .
=( 60 *5/18) * 9,
= 50/3 * 9,
= 50 * 3 ,
= 150 meter.
ALI AZAM said:
5 years ago
60km/hr convert into meters = 60*5/18 = 16.66 meter/sec.
This is for 1 second = 16.66 meter.
For 9 seconds just multiply by 9 = 16.66 * 9 = 150meter.
We already know that 1km/hr = 5/18meter/second.
1 meter/second = 18/5 km/hr.
This is for 1 second = 16.66 meter.
For 9 seconds just multiply by 9 = 16.66 * 9 = 150meter.
We already know that 1km/hr = 5/18meter/second.
1 meter/second = 18/5 km/hr.
(1)
ALI AZAM said:
5 years ago
60km/hr convert into meters = 60*5/18 = 16.66 meter/sec.
This is for 1 second = 16.66 meter.
For 9 seconds just multiply by 9 = 16.66 * 9 = 150meter.
We already know that 1km/hr = 5/18meter/second.
1 meter/second = 18/5 km/hr.
This is for 1 second = 16.66 meter.
For 9 seconds just multiply by 9 = 16.66 * 9 = 150meter.
We already know that 1km/hr = 5/18meter/second.
1 meter/second = 18/5 km/hr.
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