How many seconds does Sandy take to cover a distance of 500 meters, if Sandy runs at a speed of 18 km/hr?	Choose the most appropriate option:
A) 80	B) 100	C) 120	D) 140	E) 160

Rationale: "18 km / hr = 18000 m / 3600 s = 5 m / s time = 500 / 5 = 100 seconds the answer is b ."
Answer: B