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1/15 = 1/20 + 1/s'
1/s' = 1/15 - 1/20
1/s' = 4/60 - 3/60
1/s' = 1/60
s' = 60
s'/s = h'/h
60/20 = h'/4
3 = h'/4
h' = 12
M= s'/s
M= 60/20
M= 3 kali
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