Answer

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**Hint:**You should know the conversion of the unit. Like you should know $1m = 3.28ft$. You can use this and get your required answer. While substituting the values make sure that all the quantities have the same unit.

**Complete step-by-step answer:**

Here in the question, it is given that the car whose length is $4m$ and the boat whose length is $8m$.

And we need to calculate the total length, that means,

Sum of length of car and length of boat ( in $ft$)

So, first of all, we have to change the unit from $metre$ to $ft$.

You must be knowing the value of unit changing for eg., $1m = 100cm$

Like this, $metre$ and $ft$ are also related.

The relation is given by the equation

$1m = 3.28ft$

So as we know that $1m = 3.28ft$, so we can find the length of car and boat in $ft$.

So, let us calculate the required length. First we will convert the length of car in $feet$.

Now according to question, length of car is given $4m$.

As we know $1m = 3.28ft$,

So, for $4m$, it will be

$4m = 4 \times 3.28 = 13.12ft$

Now similarly we need to find the length of boat which is equal to $8m$

As we know $1m = 3.28ft$,

We can find the measurement of $8m$in $ft$ as

$8m = 8 \times 3.28 = 26.24ft$

Now we come to know that

Length of car$ = 13.12ft$

Length of boat$ = 26.24ft$

Now we need to find the sum of length of car and boat in $feet$

$ = $length of car + length of boat

$

= 13.12ft + 26.24ft \\

= 39.36ft \\

$

So, it is close to $39.37ft$, so our answer is option C.

**Note:**You must know the unit conversion. For example,

$1m = 3.28ft$

$1m = 100cm$

And so on. This is all you should learn then you can solve these questions quickly and save your time.

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