A person crosses a 1000 m long street in 10 minutes. What is his speed in km per hour?  Choose the correct choice from the following answers:
A) 7.1 B) 8.2 C) 4.6 D) 6.0 E) 12.8

Rationale: "distance = 1000 meter time = 10 minutes = 10 x 60 seconds = 600 seconds speed = distance / time = 1000 / 600 = 1.67 m / s = 1.67 ã — 18 / 5 km / hr = 6.0 km / hr answer : d"
Answer: D