exam Maths Puzzle Numerical Ability

HERE IS A QUESTION THAT i AM COMPLETELY LOST ON, I HAVE NO CLUE WHERE TO START OR HOW TO CALCULATE THIS, CAN SOMETIME GIVE IT A TRY?/ i WOULD REALLY APPRECIATE IT, iF i DO NOT RE

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exam Other Question

The height h in feet of an object after t seconds is given by the function
h = -16t^2 + 30t + 3.
How long will it take the object to hit the ground? Round your answer to the nearest thousandth.

I wish that I knew how to do this problem! Find the unit rate?

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