a 600 meter long train crosses a signal post in 40 seconds . how long will it take to cross a 7.2 kilometer long bridge , at the same speed ?
"s = 600 / 40 = 15 mps s = 7200 / 15 = 480 sec = 8 min . answer : c"
divide(divide(multiply(7.2, const_1000), speed(600, 40)), const_60)