700 miles away, to try out his luck. the ride there with the wind takes four hours. a few months later almost broke he heads back, on the same plane and the same wind. the flight then, against the wind, takes five hours. what is the speed of the plane and what is the speed of the wind?

speed of plane = 157.5 mph

speed o wind = 17.5 mph

Explanation:

Distance traveled to move from one position to other is given as

time taken by it

so here the speed is given as

during his return journey we have

now from above two equations we have

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)