I used some House Rules posited by the Gongfarmer's Almanac (whatever happened to that, btw?) and Raven Crowking, but here's big change I decided to make since I like using Theatre of the Mind:
"Instead of using feet, metres, yards, or any other measurement unit for distances we're going to go for range bands!
Close ==> Near ==> Far ==> Distant
Characters can make 3 Movements per turn, with each range band taking up different amounts of Movement: Close = 1, Near = 2, Far = 3, Distant = 4 (so you'd need more than 1 turn to reach).
For ranged attack purposes, weapons such as handaxes, javelins, daggers, and darts only use a character's STR modifier when thrown at something Close or Near. Slings can use STR mod against Far targets. Distant ranges are for the purpose of a long range weapon's farthest range capability (100' or more).
For spell casting purposes, anything with a range below 30' is considered to be able to cast at something Near, and anything above 30' can be cast Far (e.g. Cantrip's Range is Near, while Sleep's Range is Far, and Magic Missile's is Distant). A spell with the Touch range must be cast Close to the target."
