The average speed is 104 kilometer per hour
<em><u>Solution:</u></em>
Given that,
A car drives 494 km in 4 hours 45 minutes
To find: Average speed in kilometers per hour
<em><u>The average speed is given by formula:</u></em>
![Average\ speed = \frac{distance}{time}](https://tex.z-dn.net/?f=Average%5C%20speed%20%3D%20%5Cfrac%7Bdistance%7D%7Btime%7D)
From given,
Distance = 494 km
Time = 4 hours 45 minutes
We know that,
1 hour = 60 minutes
Therefore,
![45\ minutes = \frac{45}{60}\ hour\\\\45\ minutes = 0.75\ hour](https://tex.z-dn.net/?f=45%5C%20minutes%20%3D%20%5Cfrac%7B45%7D%7B60%7D%5C%20hour%5C%5C%5C%5C45%5C%20minutes%20%3D%200.75%5C%20hour)
Thus,
time = 4 hours 45 minutes = 4 hour + 0.75 hour = 4.75 hour
<em><u>Thus average speed is:</u></em>
![Average\ speed = \frac{494}{4.75}\\\\Average\ speed = 104](https://tex.z-dn.net/?f=Average%5C%20speed%20%3D%20%5Cfrac%7B494%7D%7B4.75%7D%5C%5C%5C%5CAverage%5C%20speed%20%3D%20104)
Thus average speed is 104 kilometer per hour