Two Roads, Three Ratios, and a Surprising Time Relationship On the whiteboard, a simple problem was framed: Road A is 20% longer than Road B. It is in good condition throughout, with an average speed of 60 km/h. Road B is shorter, but 80% of it is in good condition and 20% is in poor condition. The speed on the good portion is 60 km/h, while the speed on the bad portion drops to 20 km/h. Which road gets you to the destination faster? "Road B, obviously," said Rahul immediately. "You're only on the bad patch for one-fifth of the trip. The rest of the time you're matching Road A's speed, but on a shorter total distance." "Not so fast," counter-argued Priya. "That 20 km/h speed drop is severe. You lose way more time on the bad patch than you gain from the shorter distance." Instead of settling the argument directly, the teacher turned to the board. "Let's test both theories with actual numbers." Episode 1: The Concrete ...