Answer:
In my opinion solving for speed is similar to solving for time because when trying to do both of those you want to have a certain amount of time left for instance solving for speed I could Say "oh I want to solve this math question fast!"
Solving it fast will mean I have time left to do something else same with solving for time
"I want to solve this math question for time!" Meaning I want to solve it fast enough to have time left Hopefully this is what you want in an answer! I'm sorry if this isn't what you want