It is 3/60 or 1/20 in its simplest form
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1hr 15 mins is 75 mins. 3hr 20 mins is 200 mins. 75/200 is 3/8
1 hour is 60 mins. therefore 20/60 simplifies to.... 1/3
2 and 5/12 hours
1/6
1/61hour = 60 minutes3 hours = 180 minutes30/180 or 1/6 of an hour