Andre and Kayla ride their bikes from their home to school which is 8.4 kilometers away. It takes Andre 20 minutes to arrive at school and Kayla arrives 5 minutes after Andre. How much faster is Andre's average speed for the entire trip?

The correct answer is c

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later