If a car had traveled 35 kmh faster than it actually did, the trip would have lasted 30 minutes less. If the car went exactly 105 km, at what speed did it travel?  Choose the correct choice from the following answers.
A) 50 kmh	B) 55 kmh	C) 60 kmh	D) 65 kmh	E) 70 kmh
Time = Distance/Speed   Difference in time = 1/2 hrs   105/x - 105/(x + 35) = 1/2   Substitute the value of x from the options. --&gt; x = 70 --&gt; 105/70 - 105/105 = 3/2 - 1 = 1/2   Answer: 70 kmh
<result>E</result>
If a car had traveled 35 kmh faster than it actually did, the trip would have lasted 30 minutes less. If the car went exactly 105 km, at what speed did it travel?