Adc10 airplane travels 3000 km with a tailwind in 3 hr. it travels 3000 km with a headwind in 4 hr. find the speed of the plane and the speed of the wind. use substitution or elimination to solve.

The speed of plane is 875 km/h and speed of wind is 125 km/hr

Explanation:

Assuming v the speed of plane and w the speed of wind

Then, the overall speed will be given as (v+w)

The speed is calculated by the formula;

For tailwind, given distance travelled is 3000 km in 3 hrs

Putting the values in the formula;

(v+w) =  

(v+w) = 1000              ……eqn (1)

Similarly, for headwind, given distance travelled is 3000 km in 4 hrs

(v-w) =  

(v-w) = 750  ……eqn (2)

Adding (1) and (2), we get

2v = 1750

v = 875 km/hr

putting value in eqn (1), we get: w = 125  km/hr

Therefore, the speed of plane is 875 km/h and speed of wind is 125 km/hr.

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

b is 38 degrees.

a is 52 degrees.

this is because if b is 38 and a is 14 degrees more than b than 38+14=52 and 52+38=90 degrees. hope this .