book Maths Puzzle Numerical Ability

Express as a single logarithm and, if possible simplify
log(x^3-8)-log(x-2)

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book Other Question

If the two-digit integers M and N are positive and have the same digits, but in reverse order, which of the following CANNOT be the sum of M and N ?
(A) 181
(B) 163
(C) 121
(D) 99
(E) 44 the time(t) required to empty a tank varies inverse as the rate(r) of pumping. A pump can empty a tank at the rate of 1200 L/min how will it take the pump to empty the tank at 3000L?
it will take____minutes to empty the tank.