Explain the following statement: Scale to a primary six student.

The scale is $1 : 50000$, meaning $1~\mathrm{cm}~\mathrm{on~map} = 50000~\mathrm{cm}~\mathrm{actual}.$

Measured distance on map between towns: $4~\mathrm{cm}$.

Formula: $\mathrm{Actual~distance~(cm)} = \mathrm{Map~distance~(cm)} \times 50000$

Substitute: $4 \times 50000 = 200000~\mathrm{cm}.$

• Student A: $200~\mathrm{m}$ (incorrect)
• Student B: $20~\mathrm{km}$ (incorrect)
• Student C: $2000~\mathrm{m}$ (incorrect)
• Student D: $2~\mathrm{km}$ (correct)
• Student E: $20000~\mathrm{cm}$ (incorrect)
• Student F: $0.2~\mathrm{km}$ (incorrect)

Student D is correct.

$$\text{Student D}$$