Solve the Problem by Writing and Solving a Suitable System $5 \mathrm{pm}$

Solve the problem by writing and solving a suitable system of equations.
-A flight leaves San Francisco at $5 \mathrm{pm}$ and arrives in London at 11 am (London time) . This 18-hour difference includes the flight time plus the change in time zones. The return flight leaves London at $11 \mathrm{am}$ and arrives in San Francisco at 2 pm (San Francisco time) . This 3-hour difference includes the flight time minus the change in time zones, plus an extra hour due to the fact that the return flight westward is into the wind. Find the actual flight time eastward and the difference in time zones.

A) flight time eastward: 11 hours; difference in time zones: 7 hours
B) flight time eastward: 10 hours; difference in time zones: 8 hours
C) flight time eastward: 9 hours; difference in time zones: 8 hours
D) flight time eastward: 9 hours; difference in time zones: 9 hours