Aptitude - Problems on Trains - Discussion

Similarly,

Speed = [60*5/18]m/sec=50/3 m/sec.

50/3*9 = 150mtrs.

Here, give train travels at a speed of (60*5/18) m/s, that is for one second it travels a distance of 50/3 m/s. So the distance traveled for 9 seconds gives the actual length of train, that is 50/3*9=150m.

We know that
1km=1000meters
1hr=3600seconds
1km/1hr=1000/3600=10/36=5/18m/s
1km/hr=5/18m/s
60km/hr=(60*5/18).

Let length of the train be 'x' metres...
Speed of the train = 60km/hr(given)
Time = 9seconds(given)

Refer the formulas for train problems...

As the time is given in seconds and answers are given in metre(train length) We are in need to convert from km/hr to m/s
km/hr = 1000m/(60min*60sec) = 5/18 m/s

Length of the train(distance covered a post)= speed * time
= (60*(5/18))*9
= (50/3)*9
= 150 m

For the train related formulas,check the READ MORE in Left corner(Important formulas)...

@Bangaru.

If the total salary is 100%, in which 15% spent on insurance policy means 100-15 =85%.

55% spent as expenditure on shopping etc means 85-55 =30%
Savings =salary -expenditure.
30% savings equals to 12,750.

Percentage can be represented as per hundred i.e., 30/100, which is equals to 12,750.

Assume that total salary be X
X *30/100 =12,750
X =12750*100/30
X= 42500.

Can you explain the problem with diagrammatic representation ?

@Divya.

Can you explain the problem which was mentioned by you ?

We know that
1km=1000meters
1hr=3600seconds
1km/1hr=1000/3600=10/36=5/18m/s
1km/hr=5/18m/s
60km/hr=(60*5/18)

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

Dear Friends.

The problem is really nice ans soothing. I solved it firstly but when I saw the solution, I confused to see the calculation. After a deep concern and explanation I think it really a nice explanation. Okay friends after that thank to Sundar for posting another problem and solution. Thank to Kartik, Dhessappan, Jain Thomas, Rita, Valimithu, Jayanthi, Vishnu, Poonm, poja, Sunny, Sara and others.