# Aptitude - Decimal Fraction - Discussion

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

2.

What decimal of an hour is a second ?

 [A]. 0.0025 [B]. 0.0256 [C]. 0.00027 [D]. 0.000126

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?