City A to city B, David drove for 1 hour at 60 mph and for 3 hours at 90 mph. What was the average speed for the whole trip? Choices.
A) 82.5	B) 57.5	C) 58.2	D) 59	E) 62
The total distance is 1×60+3×90=330   And the total time is 4 hours. Hence,   82.5verage Speed=(Total Distance/Total Time)=330/4= 
<gadget id="calculator">330/4</gadget>
<output>165/2 = around 82.5</output>
82.5   82.5nswer : 82.5
<result>A</result>
City A to city B, David drove for 1 hour at 60 mph and for 3 hours at 90 mph. What was the average speed for the whole trip?