a) 1 km
b) 2 km
c) 3 km
d) 4 km
Answer: b
Explanation: Let the distance between school and home be x km.
The difference of time when A goes school to school with these two different speed is 10 min
$$\eqalign{
& = \frac{{10}}{{60}}\,{\text{hour}} \cr
& {\frac{x}{3}} – {\frac{x}{4}} = \frac{{10}}{{60}} \cr
& \frac{x}{{12}} = \frac{1}{6} \cr
& x = \frac{{12}}{6} \cr
& = 2\,{\text{km}} \cr} $$
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