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18 March, 11:10

On a road trip, a driver achieved an average speed of (48.0+A) km/h for the first 86.0 km and an average speed of (43.0-B) km/h for the remaining 54.0 km. What was her average speed (in km/h) for the entire trip? Round your final answer to three significant figures. A = 15 B = 1

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  1. 18 March, 12:17
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    A = 15, B = 1

    48 + 15 = 63 for the first 86km

    43 - 1 = 42 for the remaining 54 km

    time = distance/speed

    t1 = 86/63 = 1.3651hours

    t2 = 54/42 = 1.2857hours

    speed = distance/time

    s = 140/2.6508

    average speed = 52.8km/h
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