exam Maths Puzzle Numerical Ability

A cartraveling 88km/h is passed by another car going same direction at a constant speed. After 30 seconds the two cards are 600 meters apart. find the spend of the second car.

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exam Other Question

Given: ABCD is a parallelogram
Prove: AC and BD bisect each other

( I know AB parallel CD
and AD parallel BC because a parallelogram is a quad w/ 2 parallel sides)
DIAGRAM: < I cant seem to find the answer to this math problem... let along try to solve it.

the question is: if f(x) = 3x^2(squared) then find f(4) and f(3b)