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Question:

A plane left San Francisco at 6:15 pm PST and arrived in Philadelphia at 2:45 am EST. How long was the flight?

A \(5\frac{\mathrm{1} }{\mathrm{2} }\) hours
explanation

PST stands for Pacific Standard Time. EST is known as Eastern Standard Time. EST is 3 hours ahead of PST.
First, convert 6:15 PST to 9:15 EST. The flight then took from 9:15 pm EST to 2:45 am EST. That means that the flight took \(5\frac{\mathrm{1} }{\mathrm{2} }\) hours.