a 600 meter long train crosses a signal post in 40 seconds . how long will it take to cross a 5.4 kilometer long bridge , at the same speed ?
"s = 600 / 40 = 15 mps s = 5400 / 15 = 360 sec = 6 min . answer : d"
divide(divide(multiply(5.4, const_1000), speed(600, 40)), const_60)