As this is your homework, you need to work out the answer for yourself so that you learn how to do this. However to help you do this you need to understand that 1.5 hours is the same as one and a half hours and that there are 60 minutes in each hour.
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5 hours and 15 minutes.
3 hours and 15 mins
15 minutes
135 = 60 + 60 + 15
15 hours