Question

Abdul while driving to school computer the average speed his trip to be 20km/h¹ on his return trip along the same route there is less traffic and average speed is 40km/h¹ .What is the speed for Abdul trip
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Answer 1

Answer:

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Let us assume that Abdul is travelling x kilometer distance while going to school.

Distance = Speed x Time

1)When it's average speed is 20 km/hr:-

$x = v1 \times t1 \\ = 20 \times t2$

2)When it's average speed is 30 km/hr:-

$x = v2 \times t2 \\ 30 \times t2$

V$average$$= \frac{total \: distance \: travelled}{total \: time \: taken}$

V$average$$= \frac{x + x}{ \frac{x}{v1} + \frac{x}{v2} }$

$= \frac{2x}{ \frac{x}{20} + \frac{x}{30} }$

$= 24km {h}^{ - 1}$

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Answer 2

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