Noah and Ryan left Seattle at one in the afternoon, traveling in opposite directions. At 5 pm, they were 320 kilometers apart. of ryan's rate of speed is three times that of noah's, what is noah's speed?

Answer: Noah's speed is 20km/hr

Explanation:

Given;

Final Distance between them at 5pm = 320km

Time of travel = 5pm - 1pm = 4 hours

Let x represent Noah's speed

The Ryan's speed = 3x

Total distance between them in 4hours given that they are traveling at opposite directions is.

Distance = speed * time

(x + 3x) * 4hours = 320km

4x * 4 hours = 320km

x = 320km / (4*4hours)

x = 20km/hr

Noah's speed is 20km/hr