A wastewater sample subjected to standard BOD5 test yields a test result of 200 mg/L. The rate constant is 0.18/day at 20°C (to the base ‘e’). Another sample of the same wastewater is tested at a temperature of 30°C. The time in days after which the BOD yielded is 200 mg/L is ______ (up to 2 decimal places).
Enter numerical value using the virtual keypad. Round off where necessary.