Aptitude - Decimal Fraction - Discussion

Discussion :: Decimal Fraction - General Questions (Q.No.2)

2. 

What decimal of an hour is a second ?

[A]. .0025
[B]. .0256
[C]. .00027
[D]. .000126

Answer: Option C

Explanation:

Required decimal = 1 = 1 = .00027
60 x 60 3600

Shalini Mishra said: (Nov 26, 2010)  
Tell me the short trick to solve in a minute.

Sandeep said: (Apr 14, 2011)  
Tell me the short trick to solve in a minute

Rapunzel Louise said: (Apr 19, 2011)  
Why is it 60 x 60?

Sri said: (Jul 20, 2011)  
Here asked question is hour in second so we have to take minutes(60) and Hours (60) .

In decimal form as 1/60*60 thats it.

Vikas S said: (Aug 7, 2013)  
We couldn't find that answer without calculator, tell me easiest method without using calculator.

Dipika said: (Aug 11, 2013)  
Why we take 1 here as 1/60*60 ?

Vanitha said: (Aug 24, 2013)  
How to calculate 1/3600 = 0.00027? please explain.

Naath said: (Aug 30, 2013)  
1/3600

3600)1(

3600)10(0.0

3600)100(0.00

3600)10000(0.00027
7200
--------
26000
25000
-----------
01000

So,
Answer is 0.00027.

Krishna said: (Jan 28, 2014)  
Let x decimal of 1 hour=1 sec ---> (x/1000)*3600=1sec--->x=1/3.6.

x=0.277778---->x/1000=0.00027 therefore, 0.00027 decimal of 1 hour =1sec.

Bhagyavathi said: (Apr 1, 2014)  
How to calculate 1/3600=0.0027? please explain. I didn't understand.

Benjamin said: (Jul 4, 2014)  
I don't get it how the answer was arrived?

Hritik said: (Sep 16, 2014)  
Short trick, you are looking for.

An hour is 1/3600 = 1/6*1/6*1/100 = 0.166*0.166*1/100 > 0.0256/100.

So it will be slightly larger than 0.000256. Hence C.

Kapil Joshi said: (Mar 12, 2015)  
As directed by @Hritik, disintegrate 1/3600 = 1/6*1/6*1/100, which gives:

=> 0.166*0.166*0.01...... Step 1.

Step 1 can be written as;

=> (1.6*10^-1)*(1.6*10^-1)*(1*10^-2).

Solving this gives;

=>(2.56*10^-4) which equals 0.000256.

Manas Kumar Patra said: (Jun 23, 2015)  
What is the short trick to solve the problem?

Kupaza Suleiman said: (Jul 30, 2015)  
The solution has never satisfy me in regards to question.

Mangal Das Lima said: (Nov 10, 2015)  
This could be the easiest way.

Break 1/3600 into (1/36)*(1/100),

Now it is easy to find the division of 1/36 = 0.027.

And you know 1/100 = 0.01.

Now multiply them you will get 0.027*0.01 = 0.00027.

Which is the our answer. Is it the shortest way?

Magdaline said: (Nov 17, 2015)  
1/3600 = 2.77.

Why multiply that 2.77*1/10000? Please explain.

Supriya said: (Mar 16, 2016)  
1/36000 = 1/36 *1/100.

36)100(0.027
  72
  ---
  280
  252
  ---
  280
  |||
So on....

Then finally, 1/36*1/100 = 0.027/100.
= 0.00027.

K.Jeyendran said: (Aug 14, 2016)  
Friends this answer:

For 1 hours = 60mins,
1 mins = 60 sec,
So, you get multiple of mins * sec (60min * 60sec) =36,000.

Then, you can take root in 1/36,000. Finally, you get the answer is 0.00027.

Jumter said: (Sep 28, 2016)  
Why does it take 60 * 60?

Kaveri said: (Jul 20, 2017)  
Nice explanation, thanks @Naath.

Utsav Sarkar said: (Jun 12, 2018)  
How come 60 * 60 in the remainder, while the answer is .000027?

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