For a laser system operated under the same conditions, the energy received per square centimeter is directly proportional to the laser's power and the exposure time and inversely proportional to the total surface area illuminated.
In a first test, a laser with a power of 45 watts illuminates an area of 24 square centimeters for 16 seconds.
In a second test, a laser with a power of 30 watts illuminates an area of 18 square centimeters. The energy received per square centimeter in the second test is to be 20% greater than that in the first test.
How many seconds must the exposure time be in the second test?