Question 853335
let the speed with no wind be x mph

speed against wind = (x-25)

distance = 300 miles

according to the condition

Time against wind - time with no wind = 1

300/(x-25) - 300/x = 1

Take the LCM

300x-300(x-25) = x(x-25)

300x-300x+7500= x^2- 25x

x^2-25x-7500=0

x^2-100x+75x-7500=0

x(x-100)+75(x-100)=0

(x-100)(x+75) =0

taking the positive value x = 100

speed with no wind = 100 mph

d=300
speed = 100
t= 3 hours