a man can row 9 kmph in still water. when the river is running at 3.1 kmph, it takes him 1 hour to row to a place and black. what is the total distance traveled by the man?  Choose the correct choice from the following choices:
A) 2.21
B) 2.48
C) 9.24
D) 7.29
E) 7.94
<gadget id="calculator">9 + 3.1</gadget>
<output>12.1</output>

<gadget id="calculator">9 - 3.1</gadget>
<output>5.9</output>

<gadget id="calculator">12.1 * 5.9</gadget>
<output>71.39</output>

<gadget id="calculator">12.1 + 5.9</gadget>
<output>18</output>

<gadget id="calculator">71.39 / 18</gadget>
<output>3.966111</output>

<gadget id="calculator">3.966111 * 2</gadget>
<output>7.932222</output>

<result>E</result>
a man can row 9 kmph in still water. when the river is running at 3.1 kmph, it takes him 1 hour to row to a place and black. what is the total distance traveled by the man?
multiply(divide(multiply(add(9, 3.1), subtract(9, 3.1)), add(add(9, 3.1), subtract(9, 3.1))), const_2)
"m = 9 s = 3.1 ds = 12.1 us = 5.9 x / 12.1 + x / 5.9 = 1 x = 3.97 d = 3.97 * 2 = 7.94 answer : e"