a person crosses a 300 m long street in 4 minutes . what is his speed in km per hour ?
"distance = 300 meter time = 4 minutes = 4 x 60 seconds = 240 seconds speed = distance / time = 300 / 240 = 1.25 m / s = 1.25 ã — 18 / 5 km / hr = 4.5 km / hr answer : b"
divide(divide(300, const_1000), divide(multiply(4, const_60), const_3600))