a) 3.6 km/hr
b) 7.2 km/hr
c) 8.4 km/hr
d) 10 km/hr
Answer: b
Explanation:
$$\eqalign{
& {\text{Speed}} = {\frac{{600}}{{5 \times 60}}} {\text{ m/sec}} = 2{\text{m/sec}} \cr
& {\text{Converting}}\,{\text{m/sec}}\,{\text{to}}\,{\text{km/hr}} \cr
& = {2 \times \frac{{18}}{5}} {\text{ km/hr}} \cr
& = 7.2\,{\text{ km/hr}} \cr} $$
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