Abus travels 300 km south along a straight path with an average velocity of 85 km/h to the south. the bus stops for 22 minutes. then it travels 220 km south with an average velocity of 78 km/h to the south. how long does the total trip last? what is the average velocity for the total trip?

a) Answer;

= 6.72 hours

Explanation and solution;

velocity = distance over time  

Since we know the velocity and the distance, we can simply calculate time  

For the first part  

85 km/h = 300km / time  

time = 3.53 hours  

Then there is a 22 min stop, which is the same as 0.37 hours  

so far the trip is:  

3.53 + 0.37 = 3.9 hours  

then for the last stretch:  

78 km/h = 220 km / time  

time = 2.82 hours  

So the total trip is:  

3.9 + 2.82  = 6.72 hours

b) Answer;  

=  77.38 km/hr

Explanation and solution;

we take the total distance divided by the total time to get the average.  

total distance = 300 km + 220 km = 520 km  

total time = 6.72 hours  

Average velocity = 520 km / 6.72 hours =  77.38 km/hr

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.