If a car had traveled 25 kmh faster than it actually did, the trip would have lasted 30 minutes less. If the car went exactly 75 km, at what speed did it travel?	Pick
A) 30 kmh B) 40 kmh C) 45 kmh D) 50 kmh E) 55 kmh
Time = Distance/Speed   Difference in time = 1/2 hrs   75/x - 75/(x + 25) = 1/2   Substitute the value of x from the options. --&gt; x = 50 --&gt; 75/50 - 75/75 = 3/2 - 1 = 1/2   Answer: 50 kmh
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If a car had traveled 25 kmh faster than it actually did, the trip would have lasted 30 minutes less. If the car went exactly 75 km, at what speed did it travel?