If car \(X\) followed car \(Y\) across a certain bridge that is \(21\)-mile long, how many seconds did it take car \(X\)

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If car \(X\) followed car \(Y\) across a certain bridge that is \(21\)-mile long, how many seconds did it take car \(X\) to travel across the bridge?

(1) Car \(X\) drove onto the bridge exactly \(3\) seconds after car \(Y\) drove onto the bridge and drove off the bridge exactly \(2\) seconds after car \(Y\) drove off the bridge.
(2) Car \(Y\) traveled across the bridge at a constant speed of \(30\) miles per hour.

Answer: C

Source: GMAT Paper Tests
Source: — Data Sufficiency |