Va rog frumos am nevoie de rezolvarea ex 11 urgent !! Dau coroana

vabs=√(u²+v²)
td=d/vabs=d/√(u²+v²)
vabs'=√(u²+v²)
ti=d/vabs'=d/√(u²+v²)
t=td+ti=2d/√(u²+v²)=2010 s
b) vabs=u+v
td=d/(u+v)
vabs'=u-v
ti=d/(u-v)
tz=td+ti=2du/(u²-v²)=33,67 min
c)tz=2d/u=33,33 min