exam Maths Puzzle Numerical Ability

Let f(x)=1-2x and find

a) f^-1 (x) and b) 1/f(x)

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exam Other Question

Divide and simplify.

a^2/a^15
From a point on a river, two boats are driven in opposite directions, one at 10 miles per hour and the other at 6 miles per hour. In how many hours will they be 32 miles apart?

If anyone could help that would be great!
thanks