JEE MAIN - Physics (2023 - 30th January Evening Shift - No. 1)
A vehicle travels $4 \mathrm{~km}$ with speed of $3 \mathrm{~km} / \mathrm{h}$ and another $4 \mathrm{~km}$ with speed of $5 \mathrm{~km} / \mathrm{h}$, then its average speed is
$3.75 \mathrm{~km} / \mathrm{h}$
$4.25 \mathrm{~km} / \mathrm{h}$
$3.50 \mathrm{~km} / \mathrm{h}$
$4.00 \mathrm{~km} / \mathrm{h}$
Explanation
Average speed
$$ = {{\mathrm{Total\,dis\tan ce}} \over {\mathrm{Total\,time}}}$$
$$ = {8 \over {{4 \over 3} + {4 \over 5}}}$$
$$ = 3.75$$ km/h
Comments (0)
