Two Cars Approach Each Other on a Straight and Level

question 51

Multiple Choice

Two cars approach each other on a straight and level road. Car A is traveling at 75 km/h, due north and car B is traveling at 45 km/h, due south. Both velocities are measured relative to the ground.
-At a certain instant, the distance between the cars is 15 km. How long will it take, in seconds, from that instant for the two cars to meet?

• A)450 s
• B)900 s
• C)720 s
• D)1200 s
• E)1900 s

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Definitions:

Market Level Supply

The total quantity of a good or service that producers are willing to sell across the entire market at a given price level.

Marginal Costs

The swelling of total charges resulting from generating an extra unit of a good or service.

Elasticity of Market Supply

An indicator of the extent to which the supply of a product varies following a price adjustment.

Marginal Cost Curves

A graphical representation that shows how the cost of producing one more unit of a good or service varies as production increases.