a person crosses a 600 m long street in 5 minutes . what is his speed in km per hour ?
"speed = 600 / ( 5 x 60 ) m / sec . = 2 m / sec . converting m / sec to km / hr = ( 2 x ( 18 / 5 ) ) km / hr = 7.2 km / hr . answer : b"
divide(divide(600, const_1000), divide(multiply(5, const_60), const_3600))