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If in a certain population,

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If in a certain population,

by ektamatta » Sun May 25, 2008 11:51 pm
If in a certain population, people are born at an average rate of 9 people every 2 seconds and people die at an average rate of 3 people every 2 seconds, by approximately how many people does the population increase in 1 day?

a.17,280
b.25,920
c.129,600
d.259,200
e.388,800

OA is D

please explain
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by getneonow » Mon May 26, 2008 12:40 am
birth per sec = 9/2

death per sec = 3/2

increase per sec = 9/2 - 3/2 = 3

so in one day increase = 3 * 24* 3600 = 259200
Last edited by getneonow on Mon May 26, 2008 2:31 am, edited 1 time in total.
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by aatech » Mon May 26, 2008 1:37 am
getneonow wrote: so in one day increase = 3 * 24* 3600 = 388800
3 * 24* 3600 = 259200
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still confused

by ektamatta » Mon May 26, 2008 8:15 am
How did u get 3600?
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Re: still confused

by beeparoo » Mon May 26, 2008 11:37 am
ektamatta wrote:How did u get 3600?
There are 3600 sec in an hour.

Or, in longer form, (60 sec/min)(60 min/hr) = 3600 sec/hr
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