Answer

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**Hint:**For solving these problems, we need to have a clear understanding of the various units in which time is expressed and also the relation between the various units. By employing the correct formula to conversion of minutes to hours, we can easily arrive at the desired time in hours.

**Complete step-by-step solution:**

A unit of time or midst unit is any particular time interval, used as a standard way of measuring or expressing duration. Time is an interesting concept and we all are very familiar with it and know about it. However, the measurement of time requires some specification of units. There are several different units of time and they are used accordingly mostly based on certain circumstances. Time is defined as the continued progress of existence in the past, present and future. Using a unit of time one can measure the existence of events. Following are the most commonly used units of time: second, minute, hour. The conversion goes in a way that, one minute equals sixty seconds and one hour equals sixty minutes.

Using this conversion formula, we can write that,

$\begin{align}

& 1hour=60\text{minutes} \\

& \Rightarrow 1\text{minute=}\dfrac{1}{60}hours \\

& \Rightarrow 420\text{minutes}=\dfrac{420}{60}=7hours \\

\end{align}$

**Therefore, hours taken for walking every week is $7hours$ .**

**Note:**These types of problems are pretty easy to solve, but one needs to be careful otherwise small miscalculations can lead to a totally different answer. We need to carefully employ the formula for conversion of minutes to hours, and arrive at the correct answer thereby getting the desired conversion.

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