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b) 0,8 cm
c) 0,9 cm
a) 25min
1h=60min
60min- 1,2cm
25min- x
x=1,2*25/60
x=0,5cm
b) 40min
60min-1,2cm
40min-x
x=40*1,2/60
x=0,8cm
c) 45min
60min-1,2cm
45min-x
x=45*1,2/60
x=0,9cm