exam Maths Puzzle Numerical Ability

"A" IS DRIVING 40 MPH. AFTER "A" AS DRIVEN 30 MILES, "B" STARTS DRIVING IN THE SAME DIRECTION AT WHAT RATE MUST "B" DRIVE TO CATCH UP TO "A" IN 5 HOURS?

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Can you help me with this math problem?

Find the unknown on the right side of the partial fraction decomposition.
16.) x+3/x^3+64 = A/x+4 + Bx+C/x^2-4x+16

The
-2a(-3c)+(-6y)(6r)