Rachel drives 113 miles from Pittsburg to Cleveland averaging 30 miles per hour. How fast must she drive on the return trip to average 60 miles per hour overall?

90 mph

Step-by-step explanation:

Average speed is given by

Average speed=(initial+final speed)/2

Given average speed of 60 mph then considering initial speed of 30 mph. Let x be the final speed hence

60=(30+x)/2

120=30+x

X=120-30=90 mph

Therefore, the return trip speed is 90 mph

correct answer:

a + bi

the population of other specie of birds will decline or other specie of birds will find some alternate source of food to survive.

explanation:

according to the competitive exclusion principle, which is also known as gause's law, two specie living in the same niche and feeding on the same resource cannot co-exist stably.

as we have well studied the theory of natural selection which states that only those organisms survive which have better tendency to compete for food and adapt to the environmental conditions.

coming towards the question, what wi ll happen when one species outcompetes the other for the small fish , the other specie will not get enough food and will start to die or decline in population. eventually either other specie needs to find another alternative food source for itself or migrate at some other location where there is less competition otherwise it will just not exist anymore at that niche.

hope it !