How many degrees of longitude do you cross when travelling from Sydney to London explain why. fast answer pls

The International Date Line (IDL) is an imaginary line of demarcation on the surface of Earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next. It passes through the middle of the Pacific Ocean, roughly following the 180° line of longitude but deviating to pass around some territories and island groups.

Explanation:

it has one origin of replication, but it proceeds in two directions - d)