What happens when Jump gives a jump distance greater than walking speed?

@JeremyECrawford What happens when Jump gives a jump distance greater than walking speed?

— Marcus Kouma (@MarcusXTX) March 15, 2016

Your jump is limited by how far you can move; each foot jumped uses a foot of movement (PH, 182). #DnD https://t.co/5Q8xK67jxB

— Jeremy Crawford (@JeremyECrawford) March 21, 2016

@jeremyecrawford So casting Jump on a character with a 20 STR and a move of 30’ is effectively pointless?

— Marcus Kouma (@MarcusXTX) March 21, 2016

20 Strength running long jump: up to 20 ft. With jump spell: up to 60 ft. with a speed of 30 ft. and Dash. #DnD https://t.co/TfaG4lY2N5

— Jeremy Crawford (@JeremyECrawford) March 21, 2016