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

Question

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 (A) 3.75 km / h (B) 4.25 km / h (C) 3.50 km / h (D) 4.00 km / h

Tardigrade Admin · Accepted Answer

(2/ V av )=(1/3)+(1/5)=(8/15) ⇒ V av =(15/4)=3.75 km / h

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

$3.75 km / h$

$4.25 km / h$

$3.50 km / h$

$4.00 km / h$

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

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

3.75km/h

4.25km/h

3.50km/h

4.00km/h