Alunch counter sells two types of sandwiches, roast beef and chicken salad. the profit on the sandwiches is $2 for chicken salad and $3 for roast beef. the amount of bread available is enough for 30 sandwiches. there are 2 hours available to prepare sandwiches. if chicken salad sandwiches take 3 minutes to prepare and roast beef sandwiches take 5 minutes, how many of each type of sandwich should be prepared to maximize the profit? assume all sandwiches get sold