1.5 or 1 1/2
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60 min = 1 hr ⇒ 5400 min = 5400 ÷ 60 hr = 90 hr
10 hours and 15 minutes
60 min = 1 hr ⇒ 330 min = 330 ÷ 60 hr = 51/2 hr = 5.5 hr
There are 60 min in an hr ... SO60 min x 2½ min/hr = 150 min.
(270 min) / (60 min/hr) = 4.5 hr