It is (1.5 + 12*k) hours, where k is an integer.
It is 1 hour 30 minutes.
1 and 1/2
10 and a half hours
530 minutes is 8 hours, 50 minutes.
7.75 hours
This is equivalent to 16 hours.
1460
9
1360
Time = distance / speed = 530 / 75 = 7.0666.. hours = 7 hours and 4 minutes.
Ten hours.
This is equivalent to 16 hours.
4.5
9 hours, 45 minutes