An athlete runs for 2 hours and walks for 1 hour to cover 40 km. If she runs for 2,5 hours and walks for 0,5 hour she covers 45 km, Calculate the speeds in km/h at which she runs and walks if we assume that she moves at constant speeds.
Explanation: Let walking speed= y runny speed= x They 2x+y=40 -(1)×0.5 2.5x+0.5y= 45 -(11)×1 x+0.5y=20 - 2.5x+0.5y =45/-1.5x=-25 x=-25/-1.5 x= 50/3 x= 16^2/3 for x in 1 2(50/3) +y= 40
