a 600 meter long train crosses a signal post in 40 seconds . how long will it take to cross a 1.8 kilometer long bridge , at the same speed ?
s = 600 / 40 = 15 mps s = 1800 / 15 = 120 sec = 2 min . answer : b
divide(divide(multiply(1.8, const_1000), speed(600, 40)), const_60)