problem 5.1 please

Assuming that the Horton infiltration Equation 5.4 is valid, determine the constant infiltration rate if f0=50mm/h,f at 10min is 13mm/h, and k=12.9h1. What is the infiltration rate at 20min ? Determine the infiltrated depth after 2h of wetting. 5.8 Horton Equation The Horton (1940) equation is a common model for infiltration rate, which is expressed as f=fc+(f0fc)ekt where f= infiltration rate (L/T) at time t(T), fc= steady-state infiltration rate at large times (L/T), fo= initial infiltration rate at time t=0(L/T), k= constant for a given soil and initial condition (1/T)