kathleen can paint a room in 2 hours, and anthony can paint an identical room in 7 hours. how many hours would it take kathleen and anthony to paint both rooms if they work together at their respective rates? Choose the correct choice from the following: A) 28 / 9 B) 4 / 3 C) 15 / 8 D) 9 / 4 E) 15 / 4
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/2) + (1/7)</gadget>
<output>9/14 = around 0.642857</output>

<gadget id="calculator">1 / (9/14)</gadget>
<output>14/9 = around 1.555556</output>

<gadget id="calculator">(14/9) * 2</gadget>
<output>28/9 = around 3.111111</output>

<result>A</result>
kathleen can paint a room in 2 hours, and anthony can paint an identical room in 7 hours. how many hours would it take kathleen and anthony to paint both rooms if they work together at their respective rates?
multiply(divide(const_1, add(divide(const_1, 2), divide(const_1, 7))), const_2)
( 1 / 2 + 1 / 7 ) t = 2 t = 28 / 9 answer : a