What is the approximate distance, in kilometres, along the equator between longitudes 150°E and 151°E?

At the equator, one degree of longitude is approximately the same length as one degree of latitude: about **111 km**, or 60 NM. The question asks for kilometres, so 111 km is the appropriate choice. Away from the equator, the distance per longitude degree is smaller.\n\n**Key takeaway:** At the equator, $1^\circ$ longitude is about 60 NM or 111 km.\n\n**Glossary:** **Equator**: the zero-degree parallel of latitude.