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 7 of 59.
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:
7 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:
4 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:
4 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.
Spandana pamuru said:
1 month ago
150 is the answer.
First of all, we convert speed into m/sec because time is in sec, so we can divide.
Speed * 5/18
Then we can calculate using the length formula i.e.., speed * time.
50/3 * 9 = 150m
So, the answer is 150m.
First of all, we convert speed into m/sec because time is in sec, so we can divide.
Speed * 5/18
Then we can calculate using the length formula i.e.., speed * time.
50/3 * 9 = 150m
So, the answer is 150m.
(10)
Jdajose said:
1 decade ago
Why don't we just convert 9 sec into hour? It would be easier to do the v = d/t formula.
9 s (1 min/60 s) (1 hr/60 min) = 0.0025 hr.
Then substitute: 60 km/hr = d/0.0025 hr.
D = 0.15 km/hr (1000 m).
Distance = 150 meters.
9 s (1 min/60 s) (1 hr/60 min) = 0.0025 hr.
Then substitute: 60 km/hr = d/0.0025 hr.
D = 0.15 km/hr (1000 m).
Distance = 150 meters.
Arvind_ap said:
1 decade ago
1 km = 1000 meters.
1 hr = 3600 seconds.
1 km/hr = 1000/3600 m/s.
= 10/36 m/s.
= 5/18 m/s.
1 km/hr = 5/18 m/sec.
60 km/hr = 60 x 5/18 m/sec.
= (60 x 5)/18.
= 300/18.
So in 1 sec speed is 16.66.
9 sec = 16.66*9 = 150.
1 hr = 3600 seconds.
1 km/hr = 1000/3600 m/s.
= 10/36 m/s.
= 5/18 m/s.
1 km/hr = 5/18 m/sec.
60 km/hr = 60 x 5/18 m/sec.
= (60 x 5)/18.
= 300/18.
So in 1 sec speed is 16.66.
9 sec = 16.66*9 = 150.
Akshay Babu said:
2 years ago
Speed = 60 KM/H.
D = ?
T = 9 S.
[Km/h - M/s = 5/18] [M/s - Km/h = 18/5].
Speed is in km/h and time is in seconds.
Convert the speed from km/h to M/s.
So,
Speed = 60 * 5/18 = 50/3 (Fraction).
D = 50/3 * 9 =450/3 = 150 M.
D = ?
T = 9 S.
[Km/h - M/s = 5/18] [M/s - Km/h = 18/5].
Speed is in km/h and time is in seconds.
Convert the speed from km/h to M/s.
So,
Speed = 60 * 5/18 = 50/3 (Fraction).
D = 50/3 * 9 =450/3 = 150 M.
(15)
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