The least number which is exactly divisible by 5, 6, 8, 10 and 12 is:

240 180 150 1250

240

Take LCM of 5, 6, 8, 10 & 12 = 120 Therefore, 120 or its multiple will be the answer. Hence in the given option 240 is multiple of 120, ∴ 240 is correct answer