ch02-p097 - 97 The(ideal driving time before the change was...

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97. The (ideal) driving time before the change was t = Δ x / v , and after the change it is t' = Δ x / v' . The time saved by the change is therefore tt x vv xx −= F H G I K J =− F H G I K J = ' ' . ΔΔ Δ 11 1 55 1 65 0 0028 h / mi bg which becomes, converting
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