In the first half of the 1800s, how did the arrival of large numbers of immigrants affect economic conditions in us cities? the number of available jobs rose. there were fewer jobs available. everyone's wages decreased. cities had more money to spend.

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?