Question

A car is moving on the straight road and covered one fourth part with 36m/s and rest with 54m/s. find the average speed.​

Answer 1

Answer:-

• Speed on completing 1/4 of road=36m/s
• speed on completing 3/4of road=54m/s

The road is divided into 4parts hence total time taken will be 4.

We know that

$\boxed{\sf Average\:Speed=\dfrac{Total\:Distance\:Covered}{Total\:Time}}$

$\\ \qquad\quad\sf\Rrightarrow Average\:speed=\dfrac{36+3(54)}{4}$

$\\ \qquad\quad\sf\Rrightarrow Average\:Speed=\dfrac{36+162}{4}$

$\\ \qquad\quad\sf\Rrightarrow Average\:Speed=\dfrac{198}{4}$

$\\ \qquad\quad\sf\Rrightarrow Average\:Speed=14.5m/s$

Answer 2

Answer:

14.5 metre

Explanation:

speed of completing 2/4 of road= 36 metre/s

speed on completing 3/4 of road= 54 metre/s

everage speed 36+3( 54)

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4

= 36 + 162

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4

= 198

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4

Ans- 14.5