The past tense of the verb ‘speed’ is ‘sped’. This form is used to describe an action that has already happened. For example, ‘Yesterday, he sped through the streets to get to the meeting on time.’
It’s important to note that ‘speed’ can also be used in its past tense form as ‘speeded’, especially in British English. However, ‘sped’ is more commonly used in American English. For instance, ‘The car speeded up as it approached the hill.’
Both ‘sped’ and ‘speeded’ are correct, but the choice between them often depends on the regional variety of English being used.