Question

A car with half the distance of 40km/h of your fourney and half the distance of V km/h. Find out the value the car if the average speed as 48 km/h.

Answer 1

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Answer 2

Answer:

The value of V is 60 km/h.

Explanation:

Given that,

Average speed = 48 km/h

A car with half the distance of 40 km/h of your journey and half the distance of V km/h.

The car covered total distance 2 d.

The distance is the product of the speed and time.

The taken in half distance

$t_{1}=\dfrac{d}{40}$

The taken in half distance

$t_{2}=\dfrac{d}{v}$

The average speed is the total distance upon total time.

$v_{avg}=\dfrac{2d}{\dfrac{d}{40}+\dfrac{d}{V}}$

$48=\dfrac{2d}{\dfrac{d}{40}+\dfrac{d}{V}}$

$80v-48v=1920$

$v=\dfrac{1920}{32}$

$v = 60\ km/h$

Hence, The value of V is 60 km/h.