Question

A man travels with a speed 30kmph for first half of the journey time and with a speed of 70kmph for the next half of the journey time find the average speed of the journey
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Answer 1

Step-by-step explanation:

Let the car travel a distance of 2d km, total.

The first half of the distance takes d km/30 kmph = d/30 hr.

The second half of the distance takes d km/50 kmph = d/50 hr.

So the total time taken to cover 2d km = (d/30)+(d/50) = 80d/150 hr.

The average speed of the car = Total distance/ total time = 2d/[80d/150]

= 2d*150/80d

= 37.5 kmph.

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Answer 2

Answer:

$V_{avg}=50kmph$

Step-by-step explanation:

Given that,

$V_{1}=30kmph$

$V_{2} = 70kmph$

$V_{avg}=?$

Journey time

$V_{avg}=\frac{V_{1}+V_{2} }{2\\}$

       $=\frac{30+70}{2}=\frac{100}{2}=50kmph$

$V_{avg}=50kmph$