Average speed for car traveling east then northeast

[lalahelp]

Homework Statement

A car travels east at 86 km/h for 6 h. It then travels 50.0° east of north at 112 km/h for 6 h.
(a) What is the average speed for the trip?


How do I solve for the average speed?

 

[SammyS]

What's the definition of average speed?

You'll need to know that before you can calculate it.