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If a boat travels from Town A to Town B, it has to travel ${687.5\ {\rm mi}}$ along a river.

A boat traveled from Town A to Town B along the river’s current with its engine running at full speed. This trip took ${27.5\ {\rm hr}}$ .

Then the boat traveled back from Town B to Town A, again with the engine at full speed, but this time against the river’s current. This trip took ${62.5\ {\rm hr}}$ .

Write and solve a system of equations to answer the following questions.

The boat’s speed in still water with the engine running at full speed is .

The river current’s speed was .

Use mi for miles, and hr for hours.

You can earn partial credit on this problem.