Answer :
It would take 20 seconds. Because it says 1/2 a sample per second, it would take 2 second to produce 1.
10 (the amount of sensors)
2 (seconds it takes to create a full sensor)
10 x 2 = 20. Therefore, your answer is 20.
10 (the amount of sensors)
2 (seconds it takes to create a full sensor)
10 x 2 = 20. Therefore, your answer is 20.