Question

a railroad crew can replace 400 meters of rail in 5 days. How many kilometers can they replace in 20 days?

Answer 1

Answer: 1.6 km

Explanation:

If they can replace 400 meters in 5 days, that means they can replace 80 meters in 1 day, (400/5). So in 20 days, they will do 20x80 = 1600 meters. Since 1000 meters make one km, 1600/1000 = 1.6 km in 20 days