The average speed of one airplane is 200 mph faster than that of an automobile. if the automobile starts at 3 a. m. and the airplane starts from the same place at 11 a. m., they will have traveled the same number of miles by 1: 00 p. m. find the rate of the automobile.

Let the speed of the car be "X". From 3 am until 1 pm (10 hours), the car will travel 10*X miles. 
The speed of the aeroplane is (X +200). From 11 am until 1 pm (2 hours), the plane will travel 2*(X+200). 
The distance travelled is the same, so: 

10*X = 2*(x+200)= 2x+400 
Subtract 2*X from both sides: 
8*X = 400
X = 400/8 = 50 mph. 

Hope this helps.

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