Cycling distance

Daddy cycles the distance. 15 km in three-quarters of an hour. What distance will he travel in an hour? How long will it take for the son to cover this distance, which travels at an average speed of 15 km per hour?

Result

s₁ =  20 km
t₂ = 1:20 h

Step-by-step explanation:

$$\begin{gathered} s=15\text{km} \\ t=3/4=\frac{3}{4}=0.75\text{h} \\ {v}_1=s/t=15/0.75=20\text{km/h} \\ T=1\text{h} \\ {s}_1=v_1\cdot T=20\cdot 1=20\text{km} \end{gathered}$$

$$\begin{gathered} v_2=15\text{km/h} \\ {t}_2=s_1/v_2=20/15=\frac{4}{3}=1.33333=1:20\text{h} \end{gathered}$$

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