exam Maths Puzzle Numerical Ability

5x+2+3(x-1)

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solve the system using the linear combination method: 5x+y=6 -5x+3y=-22 Smith bicycled 45 miles going east form Durango, and Jones bicycled 70 miles. Jones averaged 5 miles per hour more than Smith, and his trip took one-half hour longer than Smith�s. How fast was each one traveling?