A person crosses a 500 m long street in 4 minutes. What is his speed in km per hour? Pick one:
A) 7.5
B) 2.6
C) 3.9
D) 8.2
E) 2.7

Rationale: "distance = 500 meter time = 4 minutes = 4 x 60 seconds = 240 seconds speed = distance / time = 500 / 240 = 2.08 m / s = 2.08 ã — 18 / 5 km / hr = 7.5 km / hr answer : a"
Answer: A