After leaving Moose Jaw Hanson drove 200 kilometers at x kmh

After leaving Moose Jaw, Hanson drove
200 kilometers at x km/hr and then decreased his speed by
20 km/hr and drove 240 additional kilometers. Write a rational expression for
his total traveling time. Evaluate the expression for x = 100.

Solution

After leaving Moose Jaw, Hanson drove
200 kilometers at x km/hr and then decreased his speed by
20 km/hr and drove 240 additional kilometers. Write a rational expression for
his total traveling time. Evaluate the expression for x = 100.
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time = distance/rate
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Equation:
Total time = 200/x + 240/20
Total time = 200/x + 12
T(100) = 200/100 + 12
T(100) = 2 + 12 = 14 hours.