A Boat Travels Upstream (Against the Current) Between Two Points $10$

question 115

Essay

A boat travels upstream (against the current) between two points on a river $10$ mi apart in $2.5$ hours. The return trip downstream takes only $45$ minutes. What is the boat's speed, and how fast does the current in the river flow?

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Definitions:

Norm of Reciprocity

A social norm dictating that people should respond to others with the same kind of behavior they have received.

Kin Selection

An evolutionary strategy that favors the reproductive success of an organism's relatives, even at a cost to the organism's own survival and reproduction.

Altruism

The desire to help another purely for the other person’s benefit, regardless of whether we derive any benefit.

Prosocial Video Games

Video games designed with the purpose of promoting positive social behaviors, such as cooperation, helping, and empathy.