Correct?

A racecar can travel 2 laps in 4 minutes. At this rate, how long will it take the racecar to complete 75 laps (in minutes) ?

my answer:

4/2 = x/75

2x = 4 * 75

2x = 300

2x/2 = 300/2

x = 150

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How much is 3/4 cup & 3/4 cup =