exam Maths Puzzle Numerical Ability

f(x)=-3x+2 and g(x)=2x+9: find (g*f)(x)
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f(x)= cubed sqrt (under square root is x-6) A cyclist traveling at a constant speed completes 3/5 of a trip in 1 1/2 hrs. In how many additional hours will the cyclist complete the entire trip?