if a bacteria multiplies itself in to two every second.in an hour there are 5M, at what time it reaches 2.5M?

Answer 1

using your rate = 0:59:59

at 1hr they equal 5million so 1sec beforehand they would have numbered 2.5million

At 1:00:01 there would be 10million and so on

Answer 2

they dont multiply every second they can divide every 20 minutes, but thats pretty much the minimum. you answer is roughly 40 minutes i could work it out properly but i dont want to,
according to your figure of 1 sec it would only take 22 seconds to make wel over 2.5 million and 23 seconds to reach 5 million. using the 20 minute figure that i suggested it would take 6 hours 40 minutes to get to 1 million 7 hours to get to 2 million 7 hours 20 minutes to get to 4 million. so im not sure that helps you that much, but i hope it does,

Answer 3

time it reaches 2.5m= 60/5
=12 second
=12*2.5
=30 second

Answer 4

this is an arithmetic progression....if it doubles every seconds a bacteria reaches 2.5 mil in 59 min 59 sec

Answer 5

One hour minus one second. In that final second of the hour, the number doubles from 2.5 M to 5 M.

Answer 6

59 min 59 seconds = 2.5M
after 1 sec i.e. 1 hour = 5M

Answer 7

59 minutes 59 seconds

Answer 8

59 min 58 sec

Answer 9

Then we'd have a serious problem!!!

The fastest muliplying bacterium is E.coli which can self-replicate under ideal conditions in 20 minutes using a two-way rolling-circle genome replication technique.

Every two seconds?! I think not!

Answer 10

1 sec = 1
2 secs = 2
3 secs = 4
4 secs = 8
11 secs = 10
21 secs = 1,048,256
22 secs = 2.096,512

Just over 22 seconds, not minutes at all.

In an hour there with would be billions of billions of billions.