Question

The odometer of a car reads $3000\text{km}$ at the start of a trip and $3400\text{km}$ at the end of the trip. If the trip took $8\text{hr}$, calculate the average speed of the car in ${\text{m min}}^{-1}$.

• A. $236.45{\text{m min}}^{-1}$
• B. $874.03{\text{m min}}^{-1}$
• C. $833.33{\text{m min}}^{-1}$
• D. $1500{\text{m min}}^{-1}$

Answer 1

The correct option is C $833.33{\text{m min}}^{-1}$

Total distance covered by car $=(3400-3000)\text{km}=400\text{km}$

Total time taken $=8\text{hr}$

Average speed:$=\frac{\text{Total distance covered}}{\text{Total time taken}}$

$=\frac{400}{8}=50\text{kmph}$

$1\text{km}=1000\text{m}$ and $1\text{hr}=60\text{min}$

$\therefore 50\text{kmph}=\frac{50\times 1000}{60}{\text{m min}}^{-1}$

$=833.33{\text{m min}}^{-1}$