exam Maths Puzzle Numerical Ability

If a document that is 6 inches long is traveling 250 inches per seconds past a transport sensor,how long in milliseconds will the sensor be covered?

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I do not understand the demand and supply equations - please help!

The demand and supply equations for a certain item are given by

D = -5p + 40
S = -p^2 + 30p - 8
What is t Three times a number, added to4 is 7. Find the number