A toy airplane climbs 30 vertical feet while traveling 50 feet horizontally. A toy helicopter climbs 20 feet while traveling 40 feet horizontally. Assuming a steady rate of change, which toy traveled at a greater slope?

answers
The airplane did, because Three-fifths greater-than one-half.
The airplane did, because Five-thirds greater-than 2.
The helicopter did, because 2 greater-than five-thirds.
The helicopter did, because One-half greater-than three-fifths.