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18 March, 13:36

Sally travels by car from one city to another. She drives for 30.0 min at 80.0 km/hr, 12.0 min at 105.0 km/hr, and 45.0 min at 40.0 km/hr, and she spends 15.0 min eating lunch and buying gas.

A. Determine the average speed for the trip.

B. Determine the total distance traveled.

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  1. 18 March, 17:25
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    Total distance = (30/60 x 80) + (12/60 x 105) + (45/60 x 40) = 0.5 x 80 + 0.2 x 105 + 0.75 x 40 = 40 + 21 + 30 = 91 km

    Average distance = total distance / time taken = 91 / (30/60 + 12/60 + 45/60) = 91 / (0.5 + 0.2 + 0.75) = 91/1.45 = 62.76 km/hr
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Home » Physics » Sally travels by car from one city to another. She drives for 30.0 min at 80.0 km/hr, 12.0 min at 105.0 km/hr, and 45.0 min at 40.0 km/hr, and she spends 15.0 min eating lunch and buying gas. A. Determine the average speed for the trip. B.
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