Irwin rode his bicycle from one end of a trail to another and back at a speed of 20 miles per hour. If the trail is 4 miles long, for how many hours was Irwin riding?

Plz hurry in the vedic age, what types of goods were traded most often? a.goods that there is a shortage ofb.goods that are expensive and rarec.goods that there is a surplus ofd.goods that are cheap but rarebe the