Johny went to his uncle's house, riding his bicycle at $15 k m / h$ and came back at $10 k m / h$ . What's his average speed for the whole journey?

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Solution

Let $x = 15 k m p h$ and $y = 10 k m p h$
Average speed $= \frac{2 x y}{x + y}$
$= \frac{2 \times 15 \times 10}{15 + 10}$
$= \frac{300}{25}$
$= 12 k m p h$
Hence the average speed of the whole journey is 12 kmph

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Johny went to his uncle's house, riding his bicycle at 15km/h and came back at 10km/h. What's his average speed for the whole journey?

Let x=15 kmph and y=10 kmphAverage speed =2xyx+y =2×15×1015+10 =30025 =12 kmphHence the average speed of the whole journey is 12 kmph

Johny went to his uncle's house, riding his bicycle at $15 k m / h$ and came back at $10 k m / h$ . What's his average speed for the whole journey?

Let $x = 15 k m p h$ and $y = 10 k m p h$
Average speed $= \frac{2 x y}{x + y}$
$= \frac{2 \times 15 \times 10}{15 + 10}$
$= \frac{300}{25}$
$= 12 k m p h$
Hence the average speed of the whole journey is 12 kmph