A swimmer swims downstream 55 km and upstream 10 km taking 5 hours each time; what is the speed of the current?
Choose the correct choice from the following options.
A) 4.6
B) 4.5
C) 4.4
D) 4.3
E) 4.2
55 --- 5 DS = 11   ? ---- 1   10 ---- 5 US = 2   ? ---- 1 S = ?   S = (11 - 2)/2= 
<gadget id="calculator">(11 - 2)/2</gadget>
<output>9/2 = around 4.5</output>
4.5   Answer:4.5
<result>B</result>
A swimmer swims downstream 55 km and upstream 10 km taking 5 hours each time; what is the speed of the current?