Which is not a function of the circulatory system?

Late at night some traffic signals change patterns and become ?

Of the 168 hours in a week as a full time student you should spend how many hours per week on school work?

17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?