Question

Approximately 2 x 104 vehicles drive across the top of Hoover Dam between Nevada and Arizona daily. How many days will it take until the one millionth car crosses the dam? 50 500 5000

Answer 1

if 2 * 10^4 cars drive daily,

how many days will it take for 1 *10^6 to pass

`\begin{gathered} 1\text{day}=2*10^4cars \\ \text{xdays}=1*10^6cars=10^6 \\ \text{cross multiply both sides and solve for x} \\ 1*10^6=x*2*10^4 \\ \text{divide both sides by 2}*10^4 \\ x=(1*10^6)/(2*10^4) \\ x=50 \end{gathered}`

it will take approximately 50 days for 1*10^6 cars to pass through

the answer is 50 days which is option b