exam Maths Puzzle Numerical Ability

hey could you please help me out with this permutation problem:

P(n,5)=20P(n,3)

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exam Other Question

decide all values of b in the following equations that will give one or more real number solutions.

(A) 3x^2+bx-3=0
(B) 5x^2+bx+1=0
(c) -3x^2+bx-3=0

(D) Write a rule for ju At 10am a car leaves a house at a rate of 60mph. At the same time, another car leaves the same house at a rate of 50mph in the opposite direction. At what time will the cars be 330 miles apart?