Avinash travels half the distance from his home to office at speed of 15 km/hr and rest of the journey at 30 km/hr. Find the average speed of Avinash on his way to office.

10 km/hr

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20 km/hr

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30 km/hr

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15 km/hr

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Solution

The correct option is B
20 km/hr

Average speed = We do not have distance d and time t so let's assume one and find other with respect to it using the formula --------

Yeah:! You are right

$S p e e d = \frac{D i s t a n c e}{t i m e}$

I know speed

I assume distance as d km

I find time as

Let's assume half the distance from his home to office be dkm

So first half

d = dkm

s = 15 km/hr

$t_{1} = \frac{d}{15}$

Second half

$d_{2} = d k m$

$s_{2} = 30 k m / h r$

$t_{2} = \frac{d}{30} h r$

Average speed = 20 km/hr

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