A boy swims downstream 56 km and upstream 42 km taking 7 hours each time; what is the speed of the current? Pick
A) 5	B) 4	C) 3	D) 2	E) 1
56 --- 7 DS = 8   ? ---- 1   42 ---- 7 US = 6   ? ---- 1 S = ?   S = (8 - 6)/2= 
<gadget id="calculator">(8 - 6)/2</gadget>
<output>1</output>
1   Answer:1
<result>E</result>
A boy swims downstream 56 km and upstream 42 km taking 7 hours each time; what is the speed of the current?