A man swims downstream 72 km and upstream 45 km taking 9 hours each time; what is the speed of the current?
Choose the correct choice from the following choices
A) 1.5
B) 1.8
C) 1.6
D) 1.3
E) 1.1
72 --- 9 DS = 8   ? ---- 1   45 ---- 9 US = 5   ? ---- 1 S = ?   S = (8 - 5)/2= 
<gadget id="calculator">(8 - 5)/2</gadget>
<output>3/2 = around 1.5</output>
1.5   Answer:1.8
<result>B</result>
A man swims downstream 72 km and upstream 45 km taking 9 hours each time; what is the speed of the current?