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How many seconds are there in 3 days?
A.259200 s
B.172800 s
C.24800 s
D.72000 s

Answer
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Hint: This question can easily be solved using the facts that how many seconds are in a minute, how many minutes are there in an hour and how many hours are there in a day. Hence, we would easily be able to find how many seconds are there in 3 days by just multiplying these facts correctly without making any kind of calculation mistakes.

Complete step-by-step answer:
Now, as we know, there are 60 seconds in 1 minute.
1min=60s
Also, in 1 hour, there are 60 minutes
1hour=60min
Hence, from both the sentences, we know that in 1 hour, there are 60 minutes and in 1 minute there are 60seconds.
Hence,
1hour=60×60s
1hour=3600s
Now, in 1 day, there are 24 hours.
Hence, total seconds in a day would be:
1day=24hours=24×3600s
1day=86400s
Now, since, in a day there are 86400 seconds.
Hence, total number of seconds in 3 days will be:
3days=3×86400s
3days=259200s
Hence, option A is the correct option.

Note: This question can also be solved using the ‘Unit Factor Method’ which means that if we multiply any expression or number by ‘one’, then the expression or number would remain unchanged, i.e. their value would not be affected.
First of all, we would write all the basic facts related to this question that we know, i.e.
1day=24hours
1hour=60min
1min=60s
Now, using Unit Factor, we can write all the above three facts as:
24hours1day=1
60min1hour=1
60s1min=1
Now, we have to find out how any seconds are there in 3 days.
3days=3days×24hours1day×60min1hour×60s1min
Now, we will eliminate days, hours and min from numerator and denominator respectively (as they will cancel out with each other)
3days=3×24×60×60s
3days=259200s
Hence, option A is the correct answer.
We can solve this question using either of the two ways.
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