Question

a cyclist rides at an average speed of 30 mi/h. part a if he wants to bike 154 km, how long (in hours) must he ride? express your answer in hours to two significant figures. time = h

Explanation:

Step1: Convert kilometers to miles

1 mile is approximately 1.60934 km. So, 154 km in miles is $154\div1.60934\approx95.69$ miles.

Step2: Use the speed - time - distance formula

The formula is $t = \frac{d}{v}$, where $t$ is time, $d$ is distance and $v$ is speed. Given $v = 30$ mi/h and $d\approx95.69$ miles. Then $t=\frac{95.69}{30}\approx3.2$ h.

Answer:

3.2 h