A car travels first 13rd of the distance AB at 30 km-h- next 13rd of the distance at 40 km-h- last 13rd of the distance at 24 km-h- Its average speed for the whole journey is -

We know that, average speed, v=Total distanceTotal time ⇒ v=dd/330+d/340+d/324=30 km/h Hence, option (C) is the correct answer. ...

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Physics

Average speed

A car travels...

Question

A car travels first $\frac{1}{3^{rd}}$ of the distance $A B$ at $30 km/h$ , next $\frac{1}{3^{rd}}$ of the distance at $40 km/h$ , last $\frac{1}{3^{rd}}$ of the distance at $24 km/h$ . Its average speed for the whole journey is -

40 km/h

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

35 km/h

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

30 km/h

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

28 km/h

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

Open in App

Solution

The correct option is C $30 km/h$
We know that, average speed,

$v = \frac{Total distance}{Total time}$

$\Rightarrow v = \frac{d}{\frac{d / 3}{30} + \frac{d / 3}{40} + \frac{d / 3}{24}} = 30 km/h$

Hence, option $(C)$ is the correct answer.

Suggest Corrections

Similar questions

Q. A car travels first

\frac{1}{3^{rd}}

of the distance

A B

30 km/h

, next

\frac{1}{3^{rd}}

of the distance at

40 km/h

, last

\frac{1}{3^{rd}}

of the distance at

24 km/h

. Its average speed for the whole journey is -

Q. A car travels

{\frac{1}{3}}^{r d}

distance on a straight road with a velocity of 10 km/hr, next

{\frac{1}{3}}^{r d}

with velocity 20 km/hr and the last

{\frac{1}{3}}^{r d}

with velocity 60 km/hr. What is the average speed of the car in the whole journey?

A body travels a distance of $10 km$ with a constant speed of $30 km h^{- 1}$ and then the next $40 km$ at a constant speed of $50 km h^{- 1}$ . Find the average speed for the whole journey.

Q. A bus travelling the first one-third distance at a speed of

10 km/h,

the next one-third at

20 km/h

and the last one-third at

60 km/h

. The average speed of the bus is

Q. A car coverS th of a distance at a speed of1.th of the distance at a speed of80 km/h and60 km/h. Average speed of car for complete journey is(1) 65 km/h(2) 70.5 km/h(4) 77.5 km/h(3) 66.67 km/h2/5 31L

Join BYJU'S Learning Program

A car travels first 13rd of the distance AB at 30 km/h, next 13rd of the distance at 40 km/h, last 13rd of the distance at 24 km/h. Its average speed for the whole journey is -

The correct option is C 30 km/hWe know that, average speed, v=Total distanceTotal time ⇒v=dd/330+d/340+d/324=30 km/h Hence, option (C) is the correct answer.

A car travels first $\frac{1}{3^{rd}}$ of the distance $A B$ at $30 km/h$ , next $\frac{1}{3^{rd}}$ of the distance at $40 km/h$ , last $\frac{1}{3^{rd}}$ of the distance at $24 km/h$ . Its average speed for the whole journey is -

The correct option is C $30 km/h$
We know that, average speed,

$v = \frac{Total distance}{Total time}$

$\Rightarrow v = \frac{d}{\frac{d / 3}{30} + \frac{d / 3}{40} + \frac{d / 3}{24}} = 30 km/h$

Hence, option $(C)$ is the correct answer.