From the given data, find the average speed of Jack (in km/hr).

4.43

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$\frac{13}{3}$

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4.33

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$\frac{52}{12}$

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Solution

The correct option is D
$\frac{52}{12}$

Speed is generally given in km/hr e.g., 50 km/hr, which can also be represented as $\frac{50 k m}{1 h r}$

We can derive an equation for the speed as

Speed = $\frac{D i s t a n c e}{T i m e}$

$\begin{matrix} D a y & D i s t a n c e & T i m e & S p e e d = \frac{D i s t a n c e}{T i m e} M o n d a y & 2 k m & 0.5 h r & \frac{2 k m}{0.5 h r} = 4 k m / h r T u e s d a y & 2 k m & 0.4 h r & \frac{2 k m}{0.4 h r} = 5 k m / h r W e d n e s d a y & 2 k m & 0.5 h r & \frac{2 k m}{0.5 h r} = 4 k m / h r \end{matrix}$

Average Speed = $\frac{4 km/hr + 5 km/hr + 4 km/hr}{3}$ = $\frac{13}{3} k m / h r = \frac{52}{12} k m / h r = 4.33 k m / h r$

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