a jogger running at 9 km / hr along side a railway track is 360 m ahead of the engine of a 90 m long train running at 63 km / hr in the same direction . in how much time will the train pass the jogger ?
"speed of train relative to jogger = 63 - 9 = 54 km / hr . = 54 * 5 / 18 = 15 m / sec . distance to be covered = 360 + 90 = 450 m . time taken = 450 / 15 = 30 sec . answer : c"
divide(add(360, 90), multiply(subtract(63, 9), divide(divide(const_10, const_2), divide(subtract(63, 9), const_2))))