If a car had traveled 30 kmh faster than it actually did, the trip would have lasted 30 minutes less. If the car went exactly 90 km, at what speed did it travel?	Choose the correct option:
A) 35 kmh	B) 45 kmh	C) 60 kmh	D) 75 kmh	E) 90 kmh
Time = Distance/Speed   Difference in time = 1/2 hrs   90/x - 90/(x + 30) = 1/2   Substitute the value of x from the options. --&gt; x = 60 --&gt; 90/60 - 90/90 = 3/2 - 1 = 1/2   Answer: 60 kmh
<result>C</result>
If a car had traveled 30 kmh faster than it actually did, the trip would have lasted 30 minutes less. If the car went exactly 90 km, at what speed did it travel?