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Two science teachers challenge each other to a 100m race across the football field.

The loser will grade the winner's science labs for one month. Mrs. Boulware runs the race in 10.40 s. Mrs. Hill runs the first 25.0 m with an average speed of 10.0 m/s, the next 50.0m with an average speed of 9.50 m/s, and the last 25.0 m with an average speed of 11.1 m/s. Who gets stuck grading science labs for the next month?

Sagot :

найдем время, за которые Миссис хилл пробежала первые 25 метров :

T= s/v = T1+T2+T3 + .....

T1=25/10=2.5 секунд - 1/4 от всей дистанции. Найдем T2 по такому же принципу:

T2=50/9.5 = 5.3 секундный - заняли у Хилл, чтоб пробежать следующие 50 метров, найдем T3:

T3=25/11.1=2.25 секунд - последние 1/4 от всей дистанции. Найдем общее время:

T= 2.5+5.3+2.25=10.05 секунд

10.05<10.4, следовательно Мисс Булвер ЛУЗЕР.

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