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  4. A vehicle travels 4 km with speed of 3 km / h and another 4 km with speed of 5 km / h, then its average speed is

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Q. A vehicle travels $4 \, km$ with speed of $3\, km / h$ and another $4 \, km$ with speed of $5\, km / h$, then its average speed is

JEE MainJEE Main 2023Motion in a Straight Line

Solution:

$ \frac{2}{ V _{ av }}=\frac{1}{3}+\frac{1}{5}=\frac{8}{15} $
$ \Rightarrow V _{ av }=\frac{15}{4}=3.75\, km / h $