[R] remove rows ??

[skan]

Hello

I have a file with this format

2005-01-03 09:05      0.00
2005-01-03 09:10      0.01
2005-01-03 09:15      0.02
2005-01-03 09:20      0.03
2005-01-03 09:25      0.04
2005-01-03 09:30      0.05
2005-01-03 09:35      0.06
2005-01-03 09:40      0.07
2005-01-03 09:45      0.08
2005-01-03 09:50      0.09
2005-01-03 09:55      0.10
2005-01-03 10:00      0.00
2005-01-03 10:05      0.00
....
some data may be missing


And I need to keep just the rows with time multiple of 15sec
2005-01-03 09:15      0.02
2005-01-03 09:30      0.05
2005-01-03 09:45      0.08
2005-01-03 10:00      0.00
.......


How can I do it?

thanks
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