Pls help me with this Physics Problems.. Average Speed..?
2) A car travels at 100 km/hr for 2h, at 60 km/hr for the next 2 hr and finally at 80 m/s for 1 hr. Find its average speed for the entire 5h.
3) A man drives one-third of the distance home at 25 mi/hr. How fast must he drive the rest of the way in order to average 35 mi/hr for the entire trip?
Thank you very much to those who'll be helping me.. -.-