Physics Problem I need help with.?

[fbknights52]

A car travels in a straight line with an average velocity of 70 km/h for 2.5 hours and then with an average velocity of 40 km/h for 1.5 hours.

What is the average velocity for the entire trip?

 

[sainis]

70*2.5+40*1.5/(2.5+1.5) = 58.75