if ' a ' completes a piece of work in 3 days, which ' b ' completes it in 5 days and ' c ' takes 10 days to complete the same work. how long will they take to complete the work, if they work together?  Answers.
A) 1.5 days
B) 4.5 days
C) 7 days
D) 9.8 days
E) 9 days
<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<result>A</result>
if ' a ' completes a piece of work in 3 days, which ' b ' completes it in 5 days and ' c ' takes 10 days to complete the same work. how long will they take to complete the work, if they work together?
add(subtract(3, const_2), divide(5, 10))
explanation : hint : a ' s one day work = 1 / 3 b ' s one day work = 1 / 5 c ' s one day work = 1 / 10 ( a + b + c ) ' s one day work = 1 / 3 + 1 / 5 + 1 / 10 = 1 / 1.5 hence , a , b & c together will take 1.5 days to complete the work . answer is a