A motorist covered first 20, km of his journey in 30 mifitutes and remaining 29, km in 40, minutes .

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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

$57 \frac{1}{6}$

Solution

Total distance covered $=(20+29) km =49 km$

Total time taken $=(30+40) min =70 min$

Average speed $=\left(\frac{49}{70} \times 60\right)=42 km / h$

Standard 13

Quantitative Aptitude

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