Asmall plane can fly 720 miles with the wind in 3 hours and can make the return trip in 4 hours. find the speed of the plane in still air and the speed of the wind.

Speed of the plane in still air is 210 mph and Speed of the wind is 30 mph.

Step-by-step explanation:

Since we have given that

A small plane can fly 720 miles with the wind in 3 hours and can make the  return trip in 4 hours.

Let the speed downstream be x

Let the speed of upstream be y

So, Speed of of the plane in still air be

Speed of  the wind be

According to question,

Speed of downstream is given by

Speed of upstream is given by

So, Speed of plane in still air is given by

Speed of wind is given by

Hence, Speed of the plane in still air is 210 mph and Speed of the wind is 30 mph.

step-by-step explanation:

is their an equation anywhere i can take a   look at it and see if i am right.

change of stock price/initial stock price on friday * total stock value = change of stock value

0.89/73.73 *x = 42.72

x=3539.04 = total stock value at initial stock price on friday .

total stock value at initial stock price on friday/ initial stock price on friday = number of shares

3539.04/73.73 = 48 shares

they own 48 shares of this stock