A car is on a road trip and drives 60 mph for 2 hours, and then 30 mph for 1 hour. What is the car's average speed in mph during this trip?
The car drives 60*2=
<gadget id="calculator">60*2</gadget>
<output>120</output>
120 miles for 2 hours.
The car drives 30*1=
<gadget id="calculator">30*1</gadget>
<output>30</output>
30 miles for 1 hour.
It drives a total of 120+30=
<gadget id="calculator">120+30</gadget>
<output>150</output>
150 miles.
Let S be the average speed, M be the number of miles, and H the number of hours spent driving.
Then we have, S=M/H, so, S=150 miles/3 hours = 
<gadget id="calculator">150/3</gadget>
<output>50</output>
50 mph.

<result>50</result>