How much faster, in seconds, did Susan run each mile in Week $3$ compared to Week $4$ ?

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Solution

$\Rightarrow$ On $3 r d$ week Susan cover $8$ miles in $68$ minutes.
$\Rightarrow$ Time required to cover $1$ mile on $3^{r d}$ week $= \frac{68}{8} = 8.5 M i n$
$\Rightarrow$ On $4 t h$ week Susan cover $10$ miles in $87$ minutes.
$\Rightarrow$ Time required to cover $1$ mile on $4^{t h}$ week $= \frac{87}{10} = 8.7 M i n$
$\Rightarrow$ The difference between $3 r d$ week and $4 t h$ week time to cover $1$ mile $= (8.7 - 8.5) M i n = 0.2 M i n$
Now, converting minutes to seconds $= (0.2 \times 60) S e c o n d = 12 S e c o n d s$
$∴$ Susan run each mile $12 s e c o n d$ faster in week $3$ compared to week $4$ .

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How much faster, in seconds, did Susan run each mile in Week 3 compared to Week 4?

How much faster, in seconds, did Susan run each mile in Week $3$ compared to Week $4$ ?