John has a boat that can go 20 km/hr with the current, and 16 km/hr against the current. How fast is John's rate?
Options
A) 10 Km/Hr
B) 6 Km/Hr
C) 2 Km/Hr
D) 8 Km/Hr
E) 4 Km/hr
with current = 20   against current - 16   s=?   s=(20-16)/2= 4/2= 
<gadget id="calculator">4/2</gadget>
<output>2</output>
2   Answer= 2 Km/Hr
<result>C</result>
John has a boat that can go 20 km/hr with the current, and 16 km/hr against the current. How fast is John's rate?