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

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.