1. A boy cycles 20 km in 140 minutes. How long would it take him to cycle 8 km at the same speed?

Calculation: 140 minutes over 20 km, so the ratio is \(\frac{140}{20}\).

2. It takes a garage owner 45 minutes to travel between his two garages 60 miles apart. Traveling at the same speed, how long would it take him to travel to his home 25 miles away?

Calculation: 45 minutes over 60 miles, so the ratio is \(\frac{45}{60}\).

3. A jet travels 320 km in 20 minutes. How far will it fly in 30 minutes?

Calculation: 320 km over 20 minutes, so the ratio is \(\frac{320}{20}\).

The question: Why is it that minutes are on top of miles despite it being a smaller number, when km is just whatever is larger?