Question

If the speedometer reading is 60mph on your car and you have changed the factory-installed tires(circumference of 95 inches) to bigger tires(circumference of 100 inches), you are actually traveling _____ mphchoices:A. 63B. 57C. 69.93D. 54.17

Answer 1

we can use cross-multiplication

$\begin{gathered} 95\longrightarrow60 \\ 100\longrightarrow x \end{gathered}$

where x is the real speed

$\begin{gathered} x=\frac{100\times60}{95} \\ x=63.15 \end{gathered}$

the solution is 63mph