Tiger (runs) --> Deer (runs) --->
Tiger----------------------------------------Tree--------------------------Tiger catch Deer (here)
|---------------------50 Leaps --------------|-------------x m-----------|
50*8 = 400 m .
|--------------------------------------------400 + x -------------------------|
Tiger(speed)=8*5=40m/s
Deer(speed)=5*4=20m/s
after t time tiger catch deer
t=(400+x) / 40 (tiger)
t=x / 20 (deer)
(400+x) / 40 = x/20
x=400
total time to catch deer = 400+x
= 400 + 400
= 800 m