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                           Amount of Electricity Used

This graph show the amount(数量) of electricity used in a small city. It is clear that the city uses more electricity in____  than in ____ . In summer, people use the most electricity at 12 p.m. This is probably ____ the high temperature at noon. In winter, people use the most electricity at____  The graph also shows the amount of electricity used ____ from 6 a.m. to 12 p.m. The amount of electricity use decreases (减少)from 6 p.m. to 12 a.m.

在与铁路平行的公路上，一个步行的人和一个骑自行车的人同向前进，步行人每秒走l米，骑车人每秒走3米，在铁路上，从这两人后面有列火车开来，火车通过行人用了22秒，通过骑车人用了26秒．这列火车全长多少米？