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16 March, 02:35

The Sanchez family drove 132 miles in 3 hours before lunch. Then they drove 240 miles in 5 hours after lunch.

What was their average speed for the day?

A.

46 mi/h

B.

54 mi/h

C.

54.5 mi/h

D.

46.5 mi/h

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Answers (1)
  1. 16 March, 02:48
    0
    The formula for speed is the total distance traveled over time. We shall calculate the 2 speeds individually - before and after lunch. Afterwhich, we shall add them together and divide by 2 to get the average.

    Before lunch s = 132 mi / 3 hr = 44 mi/hr

    After lunch s = 240 mi / 5 hr = 48 mi/hr

    Ave s = 48 + 44 / 2

    Ave s = 46 mi/hr

    Therefore the correct answer is A.
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