a 600 meter long train crosses a signal post in 50 seconds . how long will it take to cross a 3 kilometer long bridge , at the same speed ?
"s = 600 / 50 = 12 mps s = 3600 / 12 = 300 sec = 5 min answer : e"
divide(divide(multiply(3, const_1000), speed(600, 50)), const_60)