a) 24
b) 25
c) 27
d) 28
Answer: a
Explanation: Required average speed,
$$ = {\frac{{\left( {3 \times 40 \times 30 \times 15} \right)}}{{ {\left( {40 \times 30} \right) + \left( {40 \times 15} \right) + \left( {30 \times 15} \right)} }}} $$
$$ = 24\,{\text{km/hr}}$$
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