A water plant grew very fast such that it doubled the area of the water surface that it covered every minute. It was brought to a 100m 50m pond at 11 am. At 12 noon, it managed to cover the entire pond. Find the time when it covered at quarter of the pond.
2006-06-19 21:31:56 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
11:58 AM - every minute it doubles, so if you go back 1 minute it was half its current size and at two minutes, one quarter. Therefore it covered one quarter of the pond two minutes before noon.
2006-06-19 21:36:17 · answer #1 · answered by Pascal 7 · 0⤊ 0⤋
At 11:58 AM
2006-06-19 21:42:55 · answer #2 · answered by mohamed.kapci 3 · 0⤊ 0⤋
@ 11:58
the total surface is 100x50=5000 sqm, one quarter is 5000:4=1250 sqm
if it doubles its area every minute, this means that at 11:59 there were 5000:2=2500 sqm covered. respectively, one more minute ago [11:58] there were 2500:2=1250 sqmcovered
2006-06-19 21:39:04 · answer #3 · answered by DeviKali 1 · 0⤊ 0⤋
@ 11:58
2006-06-20 06:06:58 · answer #4 · answered by Anonymous · 0⤊ 0⤋
11:58
So in an hour it would be 120 times it's orginal size. But how big was it to start? Guess it doesn't matter.
2006-06-19 21:37:32 · answer #5 · answered by duuh 4 · 0⤊ 0⤋
i don't know, but i dig your avatar
:)
2006-06-19 21:39:03 · answer #6 · answered by hardcorepotato 3 · 0⤊ 0⤋
11.58
2006-06-19 21:35:20 · answer #7 · answered by ♥Ani♥ 4 · 0⤊ 0⤋