Question 446364
walking speed =x
running speed = x+3

d=rt
20=(x+3)*2
20=2x+6
20-6=2x
14=2x
x=7 kmph running speed
so walking speed = 4 kmph (7-3)
d=rt
d=20
r=4
20=4*t
20/4=t
t= 5 hours walking time for 20 km