The machine

The machine was in operation for nine-tenths (in a fraction) of eight hours of working time. How long has he been running?

Result

t =  7.2 h
t2 = 7:12 h Wrong answer

Step-by-step explanation:

t=109 8=109 8=1072=536 h=7.2 h
t2=t=536=7.2=7:12 h



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