A car travels at a constant speed of $70$ miles per hour for $3$ hours. What distance does it cover?

The basic distance-rate-time formula is $D = r \cdot t$. With $r = 70$ mph and $t = 3$ hr: $D = 70 \times 3 = 210$ miles. - Trap A ($73 = 70 + 3$) adds rate and time, which have different units and cannot be added. - Trap B ($140 = 70 \times 2$) misreads the time. - Trap D ($370$) reverses digit order. Units sanity check: mph $\times$ hr $= \dfrac{\text{miles}}{\text{hr}} \times \text{hr} = \text{miles}$ ✓.