Question 514053
Dave		x	mph						
Kent		5	faster	=	x+	5			
									
Dave		135	miles						
Kent		150	miles						
Dave	time	=	Kent		time				
t=d/r									
135	/	x	=	150	/(	x	+	5	)
cross multiply									
135	(	x	+	5	)	=	150	x	
135	x	+	675	=	150	x			
150	x	-	135	x	=	675			
15	x	=	675						
/	15								
x	=	45      	mph			Dave			
									
50	mph	Kent							

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