a train which has 250 m long , is running 40 kmph . in what time will it cross a person moving at 4 kmph in same direction ?
"time taken to cross a moving person = length of train / relative speed time taken = 250 / ( ( 40 - 4 ) ( 5 / 18 ) = 250 / 36 * ( 5 / 18 ) = 250 / 10 = 25 sec answer : e"
divide(250, subtract(divide(40, const_3_6), divide(divide(4, const_2), const_3_6)))