A man is riding a bike downhill at 18 Km/hr, and uphill at 4 Km/hr, what is his rate? Choose the correct option:  A) 1 Km/Hr  B) 3 Km/Hr  C) 5 Km/Hr  D) 7 Km/Hr  E) 9 Km/Hr
7 Km/Hrh = 18   Uh = 4   s=?   s=(18-4)/2 = 14/2= 
<gadget id="calculator">14/2</gadget>
<output>7</output>
7   Answer= 7 Km/Hr
<result>D</result>
A man is riding a bike downhill at 18 Km/hr, and uphill at 4 Km/hr, what is his rate?