A car travels from A to B at a speed of 20 km/hr and returns at a speed of 30 km/hr. The average speed of the car for the whole journey is

25 km/hr

No worries! We‘ve got your back. Try BYJU‘S free classes today!

24 km/hr

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

50 km/hr

No worries! We‘ve got your back. Try BYJU‘S free classes today!

5 km/hr

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B
24 km/hr

$v_{a v g} = \frac{2 v_{1} v_{2}}{v_{1} + v_{2}}$

$= \frac{2 \times 20 \times 30}{20 + 30}$

= $\frac{120}{5}$

$= 24$ km/hr

Suggest Corrections

Similar questions

Sam travelled a distance of 250 km by car in 5 hrs. Find the speed of the car?

A train travels 40 km at a uniform speed of $30 k m / h r$ . Its average speed after travelling another 40 km is $45 k m / h r$ for the whole journey. Find its speed in the second half of the journey.

Join BYJU'S Learning Program

A car travels from A to B at a speed of 20 km/hr and returns at a speed of 30 km/hr. The average speed of the car for the whole journey is

The correct option is B 24 km/hr vavg=2v1v2v1+v2 =2×20×3020+30 =1205 =24 km/hr

The correct option is B
24 km/hr

$v_{a v g} = \frac{2 v_{1} v_{2}}{v_{1} + v_{2}}$

$= \frac{2 \times 20 \times 30}{20 + 30}$

= $\frac{120}{5}$

$= 24$ km/hr