A car moves from A to B with a speed of 30 kmph and from B to A with a speed of 20 kmph. What is the average speed of the car ?

Question

A car moves from A to B with a speed of 30 kmph and from B to A with a speed of 20 kmph. What is the average speed of the car ? (A) 25 km/h (B) 24 km/h (C) 50 km/h (D) 10 km/h

Tardigrade Admin · Accepted Answer

We have given that <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/a70077ec7861ce9d3574632c4bc1f224-.png" /> Speed of Ist car v1=30 km / h Speed of IInd car v2=20 km / h The average speed of the car =(2 v1 v2/v1+v2)=(2 × 30 × 20/30+20) =(1200/50)=24 km / h

Q. A car moves from $A$ to $B$ with a speed of $30 km p h$ and from $B$ to $A$ with a speed of $20 km p h$ . What is the average speed of the car ?

25 km/h

24 km/h

50 km/h

10 km/h

We have given that

Speed of Ist car
$v_{1} = 30 km / h$
Speed of IInd car
$v_{2} = 20 km / h$
The average speed of the car
$= \frac{2 v _{1} v _{2}}{v _{1} + v _{2}} = \frac{2 \times 30 \times 20}{30 + 20}$
$= \frac{1200}{50} = 24 km / h$

Q. A car moves from A to B with a speed of 30kmph and from B to A with a speed of 20kmph. What is the average speed of the car ?