Two cars, which are 210 miles apart, drive towards each other at constant speeds. The speed of the
second car is 20 miles per hour faster than the first car. The cars pass each other in 1 1/2 hours. What is the speed of both cars?

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.