a train , 140 meters long travels at a speed of 45 km / hr crosses a bridge in 30 seconds . the length of the bridge is
"explanation : assume the length of the bridge = x meter total distance covered = 140 + x meter total time taken = 30 s speed = total distance covered / total time taken = ( 140 + x ) / 30 m / s = > 45 ã — ( 10 / 36 ) = ( 140 + x ) / 30 = > 45 ã — 10 ã — 30 / 36 = 140 + x = > 45 ã — 10 ã — 10 / 12 = 140 + x = > 15 ã — 10 ã — 10 / 4 = 140 + x = > 15 ã — 25 = 140 + x = 375 = > x = 375 - 140 = 235 answer : option c"
subtract(multiply(multiply(45, const_0_2778), 30), 140)