exam Maths Puzzle Numerical Ability

a quake sends out two waves at 8.9km/s and 5.1km/s. a siesmograph records the arrival of the 8.9km/s wave 73 seconds before the 5.1km/s wave. what is the distance from the siesmograph to the center of the quake?

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Write with positive exponents:

9x(x^-3)/18x^15

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x^-3y^-2/z^-4 The town of sprinfield purchased a Chevrolet, Ford and Toyota for total of $ 66,000. The Ford was $ 2000 more than the Cheverlot and the Toyota was $ 2000 more than the Ford. What is the price of each car?

Kindly help me. Thank you.