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## Homework Statement

A mobile is moving straight as following: the first portion of the road, equal to 10% of the total distance with the speed v1=10/s , and the rest with the speed v2=30m/s.

The average speed for the entire trip is?

**a)**25m/s

**b)**22.5m/s

**c)**20m/s

**d)**15m/s

## Homework Equations

[tex]\Delta v = \frac{\Delta d}{\Delta t}[/tex]

## The Attempt at a Solution

I calculated the times passed for both distances, replaced them in the average speed's formula and got 25 m/s, which is a wrong answer according to the key.

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