An woman swims downstream 45 km and upstream 25 km taking 5 hours each time; what is the speed of the current?
Pick
A) 2	B) 1	C) 3	D) 4	E) 2.1
45 --- 5 DS = 9   ? ---- 1   25---- 5 US = 5   ? ---- 1 S = ?   S = (9 - 5)/2= 
<gadget id="calculator">(9 - 5)/2</gadget>
<output>2</output>
2   2nswer: 2
<result>A</result>
An woman swims downstream 45 km and upstream 25 km taking 5 hours each time; what is the speed of the current?