A person crosses a 600 m long street in 5 minutes, What is his speed in km per hour?	Choose the correct choice from the following options
A) 4.3 B) 7.2 C) 2.3 D) 3.2 E) 1.1

Rationale: "explanation : speed = { \ color { blue } \ left ( \ frac { 600 } { 5 \ times 60 } \ right ) m / sec = 2 m / sec = \ left ( 2 \ times \ frac { 18 } { 5 } \ right ) km / hr = 7.2 km / hr } answer : b"
Answer: B