Mathcounts Problem

Question

A robot moving forward at a constant speed takes 2.5 hours to travel 1 kilometer. Moving forward at this same constant speed, it takes the robot 90 seconds to travel the length of a particular hallway. How many meters long is the hallway?

Answer 1

2.5 hours = 150 minutes = 9000 seconds

9000/1000 = 9 seconds per meter

in 90 seconds the distance = 90 meters