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A 5.2-cmcm-thick layer of oil (n=1.46) is sandwiched between a 1.5-cmcm-thick sheet of glass and a...

A 5.2-cmcm-thick layer of oil (n=1.46) is sandwiched between a 1.5-cmcm-thick sheet of glass and a 2.5-cmcm-thick sheet of polystyrene plastic (n=1.59).

How long (in ns) does it take light incident perpendicular to the glass to pass through this 9.2-cm-thick sandwich?

Express your answer in nanoseconds.
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