Question 53

While going to the office, Sneha travels at a speed of 10 km/h and on her way back, she travels at a speed of 15 km/h. What is her average speed for the whole journey?

Solution

average speed for the whole journey =

$$\frac{2\times Speed\ while\ going\times Speed\ while\ coming\ back}{Speed\ while\ going+Speed\ while\ coming\ back}$$

= $$\frac{2\times10\times15}{10+15}$$

= $$\frac{300}{25}$$

= 12 km/h

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