that's the solution ^
the answer is: 847.98 m^2
Single interest uses an arithmetic formula where as compound interest uses a geometric formula
Pythagorean theorem a^2+b^2=c^2
Average speed of cyclist = x
average speed of car = 3x
x = 225/5
x = 45km/h
3x = 3(45)
3x = 135km/h
average speed of cyclist = 45km/h
average speed of car = 135km/h