one pump drains one - half of a pond in 7 hours, and then a second pump starts draining the pond. the two pumps working together finish emptying the pond in one - half hour. how long would it take the second pump to drain the pond if it had to do the job alone?
Choose the most appropriate option:
A) 1 hour
B) 1.1 hour
C) 3 hours
D) 5 hours
E) 6 hours
<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">1 / 14</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">1 - (1/14)</gadget>
<output>13/14 = around 0.928571</output>

<gadget id="calculator">1 / (13/14)</gadget>
<output>14/13 = around 1.076923</output>

<result>B</result>
one pump drains one - half of a pond in 7 hours, and then a second pump starts draining the pond. the two pumps working together finish emptying the pond in one - half hour. how long would it take the second pump to drain the pond if it had to do the job alone?
divide(const_1, subtract(const_1, divide(const_1, multiply(7, const_2))))
"first pump drains 1 / 2 of the tank in 7 hours so 14 hours it will take to drain the full tank . let , 2 nd pump drains the full tank in a hours so both together can drain ( 1 / 14 + 1 / a ) part in 1 hour son in 1 / 2 hour they drain 1 / 2 * ( 1 / 14 + 1 / a ) part of the tank given that in 1 / 2 hour they drain 1 / 2 of the tank hence we can say 1 / 2 * ( 1 / 14 + 1 / a ) = 1 / 2 solving u get a = 14 / 13 = 1.1 hence answer is b"