Biking

Dhea is biking for 20 mins every day before going to school. She looked at her watch and she already achieved 10 hours of biking. How many days in total did she achieve?

Correct result:

d =  30

Solution:

$$\begin{gathered} t_1=20\text{ min}\to \text{ h}=20\mathrm{/}60\text{ h}=0.33333\text{ h } \\ t=10\text{ h } \\ d=t\mathrm{/}{t}_1=10\mathrm{/}0.3333=30 \end{gathered}$$

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