a) 45
b) 48
c) 40
d) 50
Answer: c
Explanation:
Average Speed
$$\eqalign{
& = \frac{{2 \times 60 \times 30}}{{60 + 30}} \cr
& = \frac{{3600}}{{90}} \cr
& = 40\,{\text{kmph}} \cr} $$
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