A car driver records how long it takes to finish four different journeys. For which journey does the driver have the greatest average speed?
- Adistance $60\,\text{km}$, time $2\,\text{h}$
- Bdistance $60\,\text{km}$, time $3\,\text{h}$
- Cdistance $120\,\text{km}$, time $3\,\text{h}$
- Ddistance $120\,\text{km}$, time $4\,\text{h}$