Let the speed of car be x km/h speed of train=x+5 km/h distance=speed*time thus distance covered by car: x*4=4x km distance covered by train: 7(x+5) km total distance: 4x+7x+35=255 11x=255-35 11x=220 x=20 km/h speed of train=20+5=25 km/hr
Draw a perpendicular segment from point C to the midpoint of AB. Using the trig sine function sin 80 = x/6 which gives 5.91 for the perpendicular segment. Using the formula A=1/2bh, A= 1/2 x5.91x2sqrt 2 A= 8.4