A motorist covered the first $20\, km$ of his journey in 30 mifitutes and the remaining $29\, km$ in $40\, minutes$. His average speed in $km / hr$ is:
A motorist covered the first $20\, km$ of his journey in 30 mifitutes and the remaining $29\, km$ in $40\, minutes$. His average speed in $km / hr$ is:
- A
$41 \frac{3}{4}$
- B
$42$
- C
$49$
- D
$57 \frac{1}{6}$
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