The GCM is infinite.
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190/275 = 38/55
38/55 = 0.69 hours = about 41.5 minutes
There are no common factors of 38 and 55 except 1, so the answer is no it can't be reduced.
GCM(18, 42) = 6
The gcm for 9 and 12 would be 3. :)