Question

John took 30 minutes to bicycle to his grandmother’s house, a total of 2.5 kilometers. What was his speed in km/hr?

Answer 1

5(km)/1(hr)

Explanation:

You multiply the 30 minutes to make one hour, and with that, you also multiply the 2.5 kilometers to get 5. You multiply the 2.5 because we multiply both sides of an equation.

Answer 2

Uniform line movement.

We have that the data is:

Time (t) = 30 m = 0.5 h

Distance (d)= 2.5 km

Speed (v) = ?

Since it asks us for the speed in Km/h, we make a time conversion, from minutes to hours. Knowing that 1 hr = 60 minutes, then

`\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{30 \\ot{m}*\left(\frac{1 \ h}{60 \\ot{m})\right)=0.5 \ h } } \end{gathered}$}}`

To calculate the speed, divide the distance by the time. We apply the following formula:

`\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{Speed=(Distance)/(Time) } \end{gathered}$}}`

We substitute our data in the formula and solve:

`\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V=(d)/(t) } \end{gathered}$}}`

`\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V=(2.5 \ km)/(0.5 \ h) } \end{gathered}$}}`

`\boxed{\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V=5 \ km/h} \end{gathered}$} }}`

Juan's speed was: 5 km/h.