Question 547737
Touring Bike		x				50	miles			
Racing Bike		x+	15			80	miles			
										
t=d/r										
50	/	x	=	80	/	(	x+	+	15	)
Cross multiply										
50(x+15	)	=	80	*	x	
50x+750	=80x				
80x-50	x	=	750				
30	x	=	750							
/	30									
x 	=	25	Touring Bike	mph						
		40	Racing Bike	mph