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It takes a car (x + 1) hours to travel a distance of (x2 – 9x – 10) km. At what speed is the car running? (Note: distance = rate x time)

(x3 – x2 – 9x + 10) km/h

(x + 10) km/h

(x3 – 9x2 – 9x – 10) km/h

(x – 10) km/h


Sagot :

Distance = Rate x Time

Rate (or Speed) = Distance / Time

Speed = Distance / Time

Speed = (x^2 - 9x - 10) / (x + 1)

= (x - 10)(x + 1) / (x + 1)

= (x - 10) km/hr