exam Maths Puzzle Numerical Ability

Find the surface-area-to-volume ratio for a rectangular prism with edge lengths 9,6,and 7.

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exam Other Question

Two cars leave City A at the same time to travel to city B. One car travels at 72 km/h and other at 78 km/h. If the slower car arrives 20 min. after the faster car, how far apart are City A and City B? please help me answer this problem
n+9
_____
n^2

times

6n^2
_____
n^2-8