Cara and Dan drive at constant speeds toward each other on a highway. Cara drives at a constant speed of 32 km per hour. At a certain time they pass by each other, and then keep driving away from each other, maintaining their constant speeds. If Cara is 110 km away from Dan at 7 am, and also 110 km away from Dan at 11 am, then how fast is Dan driving (in kilometers per hour)?  Choose the correct choice from the following answers:
A) 20  B) 23  C) 26  D) 29  E) 32
Cara and Dan complete 220 km / 4 hours = 55 km/hour   Dan's speed is  55-32= 
<gadget id="calculator"> 55-32</gadget>
<output>23</output>
23 km/hour   The answer is 23.
<result>B</result>
Cara and Dan drive at constant speeds toward each other on a highway. Cara drives at a constant speed of 32 km per hour. At a certain time they pass by each other, and then keep driving away from each other, maintaining their constant speeds. If Cara is 110 km away from Dan at 7 am, and also 110 km away from Dan at 11 am, then how fast is Dan driving (in kilometers per hour)?