exam Maths Puzzle Numerical Ability

Ricky drove from Town A to Town B in 3 hours. His return trip from Town B to Town A took 5 hours because he drove 15 miles per hour slower on the return trip.
How fast did Ricky drive on the trip from Town A to Town B?

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exam Other Question

The sum of the digits of a two-digit number is 8. If 16 is added to the original number, the result is 3 times the original number with its digits reversed, Find the original number. For the pair of functions, perform the indicated operation.
f(x)=4x^2-7x,g(x)=x^2-3x-28
Find f/g