What is the speed of b relative to a

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Two cars, A and B, travel in the same direction on a straight section of highway. A has a speed of 72.0 km/h, and B a speed of 80.1 km/h (both relative to the earth).

(a) What is the speed of B relative to A?

(b) If A is initially 419 m in front of B, how long will it take for B to reach A?

Reference no: EM13239473

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