Question 838139
How long did the car stop?
Does the problem really mix miles and kilometers, or is that just a typo?
If those stops were not long, we can calculate as if the car had never stopped.
In that case, the car would have traveled
{{{60miles(1.6km/"1 mile")+120km+60km=96km+120km+60km=276km}}} in
{{{1}}}{{{hour+1&1/2}}}{{{hours+1/2}}}{{{hour=3}}}{{{hours}}} .
The average speed is
{{{276km/"3 hours"=highlight(92)}}} kilometers per hour