a person crosses a 600 m long street in 5 minutes , what is his speed in km per hour ?
"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"
divide(divide(600, const_1000), divide(multiply(5, const_60), const_3600))