Solve.Two vehicles leave the same corner at the same time and travel at a right angle to each other. One vehicle travels 
an hour faster than the other. If after one hour the vehicles are 
apart, find the rate of each vehicle.
A. Slower vehicle: 12 km/hr; faster vehicle: 15 km/hr
B. Slower vehicle: 6 km/hr; faster vehicle: 9 km/hr
C. Slower vehicle: -12 km/hr; faster vehicle: -9 km/hr
D. Slower vehicle: 9 km/hr; faster vehicle: 12 km/hr
Answer: D
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