A body goes from C to D taking 10 seconds with a speed of 20 m/s and then goes from D to E in 20 seconds with a speed of 30 m/s. The average speed of the body during the whole journey is

25 m/s

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$\frac{80}{3}$ m/s

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24 m/s

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$\frac{50}{3}$ m/s

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Solution

The correct option is B
$\frac{80}{3}$ m/s

Average speed is given by $\frac{T o t a l d i s t a n c e}{T o t a l t i m e}$

In this case, the body travels a total of 800 m $(20 \times 10 + 30 \times 20)$ and total time taken was 30 seconds.

So, average speed = $\frac{800}{30} = \frac{80}{3}$ meters per second.

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A body goes from C to D taking 10 seconds with a speed of 20 m/s and then goes from D to E in 20 seconds with a speed of 30 m/s. The average speed of the body during the whole journey is

The correct option is B 803 m/s Average speed is given by Total distanceTotal time In this case, the body travels a total of 800 m (20×10+30×20) and total time taken was 30 seconds. So, average speed = 80030=803 meters per second.