The taxi charges in a city consist of a fixed charge together with the charge for the distance covered. For a distance of $10\ km$, the charge paid is $₹\ 105$ and for a journey of $15\ km$, the charge paid is $₹\ 155$. What are the fixed charges and the charge per $km$? How much does a person have to pay for travelling a distance of $25\ km$.
Given: For a distance of $10\ km$, the charge paid is $₹\ 105$ and for a distance of $15\ km$, the charge paid is $₹\ 155$.
To do: To find the fix charges and also to find the charge paid by a person to travel $25\ km/h$.
Solution:
Let the fixed charge for taxi $=₹\ x$
And variable cost per km$=₹\ y$
Total cost $=$ fixed charge$+$variable charge
According to the Question,
$x + 10y = 105$ ..... $( i)$
$x=105-10y$
$x + 15y = 155$
Putting the value of $x$ we get
$105-10y+15y=155$
$\Rightarrow 5y=155-105$
$\Rightarrow 5y=50$
$\Rightarrow y=\frac{50}{5}=10$
Putting this value in equation $( i)$ we get
$x=105-10\times10$
$\Rightarrow x = 5$
Cost for traveling a distance of $25\ km$
$=x+25y$
$=5+25\times10$
$=5+250$
$=₹\ 255$
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