tom traveled the entire 60 miles trip. if he did the first 15 miles of at a constant rate 24 miles per hour and the remaining trip of at a constant rate 45 miles per hour, what is the his average speed, in miles per hour? Choose the correct choice from the following answers:  A) 35.62 mph  B) 25.45 mph  C) 34.52 mph  D) 36.92 mph  E) 36.29 mph
<gadget id="calculator">60 - 15</gadget>
<output>45</output>

<gadget id="calculator">45 / 45</gadget>
<output>1</output>

<gadget id="calculator">15 / 24</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 + (5/8)</gadget>
<output>13/8 = around 1.625</output>

<gadget id="calculator">60 / (13/8)</gadget>
<output>480/13 = around 36.923077</output>

<result>D</result>
tom traveled the entire 60 miles trip. if he did the first 15 miles of at a constant rate 24 miles per hour and the remaining trip of at a constant rate 45 miles per hour, what is the his average speed, in miles per hour?
divide(60, add(divide(45, subtract(60, 15)), divide(15, 24)))
avg speed = total distance / total time = ( d 1 + d 2 ) / ( t 1 + t 2 ) = ( 15 + 45 ) / ( ( 15 / 24 ) + ( 45 / 45 ) ) = 60 * 2 / 3 = 36.92 mph d