Question

if a runner maintains a constant speed of 12 km/h, how long will it take to complete a marathon race of 26.2 miles?
o 2.18 h
o 3.14 h
o 3.52 h
o 5.3 h

Explanation:

Step1: Convert miles to kilometers

We know that 1 mile is approximately 1.60934 km. So, for 26.2 miles, the distance $d$ in kilometers is $d = 26.2\times1.60934\approx42.1657$ km.

Step2: Use the speed - time formula

The formula for time $t$ given speed $v$ and distance $d$ is $t=\frac{d}{v}$. Given $v = 12$ km/h and $d\approx42.1657$ km, then $t=\frac{42.1657}{12}\approx3.514$ h $\approx3.52$ h.

Answer:

3.52 h (corresponding to the third option)