A train travels at a constant speed.

What is the train’s speed between checkpoints, expressed as a unit rate?

Checkpoint A Checkpoint B

Time:2pm Time:5pm

Total miles traveled:105 Total miles traveled:285

60mph

Step-by-step explanation:

Speed is the rate of change in distance. Mathematically,

Speed = Distance/Time

Difference in distance between A and B = 285-105miles = 180miles

Total time taken between 2pm and 5pm is 3hours

Speed = 180miles/3hours

Speed = 60miles/hour

Therefore the train speed between the checkpoints is 60miles/hour

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.