Explanation

1/log3(60) + 1/log4(60) + 1/log5(60)

= log60(3) + log60(4) + log60(5) (using the change of base formula)

= log60(3×4×5) (using the product rule of logarithms)

= log60(60)

= 1 (since log60(60) is equal to 1)

So the correct answer is: 1