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2009-09-07T22:49:54+02:00
A) 25/60 =5/12
b) 60min=3600s
1/3600
c)15/3600=1/240
2009-09-07T22:50:34+02:00
25min.
25/60.

1s.
1/3600.

15s.
15/3600.


3600s. = 1h.

1h. = 60min.

2009-09-07T22:51:52+02:00
25min = 25/60 = 5/6 h
1s = 1/3600h
15s = 15/3600h = 1/240 h