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d. 1 hour/60 minutes

Step-by-step explanation:

To convert time to just seconds:

2 hours is 2 hours * (3600 seconds / 1 hour) = 2 * 3600 seconds = 7200 seconds.

45 minutes is 45 minutes * (60 seconds / 1 minute) = 45 * 60 seconds = 2700 seconds.

45 seconds is 45 seconds * (1 second / 1 second) = 45 * 1 seconds = 45 seconds.

x/3-10=8

x/3=18

x=48