How many seconds does Sandy take to cover a distance of 700 meters, if Sandy runs at a speed of 18 km/hr?
Choose the most appropriate option.
A) 100  B) 120  C) 140  D) 160  E) 180

Rationale: "18 km / hr = 18000 m / 3600 s = 5 m / s time = 700 / 5 = 140 seconds the answer is c ."
Answer: C