If you shout across a canyon and the echo returns in four seconds, how far away is the other side? (Velocity of sound in air is 300 m/s).
A) 150
B) 300
C) 600
D) 1200
E) 2400 meters

Question

Quizplus · Accepted Answer

The time taken for sound to travel from one side to another and back is 4 seconds. Therefore, the time taken for sound to travel one way is 2 seconds. 
Using the formula: distance = velocity x time, we have 
distance = 300 x 2 = 600 meters. 
Therefore, the other side of the canyon is 600 meters away.

If You Shout Across a Canyon and the Echo Returns