a) 12 km
b) 20 km
c) 25 km
d) 36 km
Answer: b
Explanation:
$$\eqalign{
& \text{Let }x\text{ be the distance} \cr
& \frac{x}{5} – \frac{x}{8} = \frac{3}{2} \cr
& \frac{8x – 5x}{40} = \frac{3}{2} \cr
& \frac{3x}{40} = \frac{3}{2} \cr
& x = 20\,{\text{km}} \cr} $$
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