Distance equals rate times time. If you have any two, you have the third. This is the travel case of rate problems. Combined work uses rates of a job, not miles, in combined work problems.
Label the three slots
150 miles in 2.5 hours is 60 miles per hour. 3 hours at 55 is 165 miles. Watch units: hours versus minutes, in reread the last sentence.
The short list is in ACT Math formulas.
The bottom line
d = rt. Rearrange. Match the unit the last sentence named.
Start practicing
Start with a free diagnostic, then drill your weak spots with 15-question quizzes and track how you're doing across Reading, English, and Math. Compare plans whenever you're ready to go further.
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