a train 285 m long , running with a speed of 54 km / hr will pass a tree in
"sol . speed = ( 54 x 5 / 18 ) m / sec . = 15 m / sec . time taken = ( 285 x 1 / 15 ) sec = 19 sec answer a"
multiply(divide(285, multiply(54, const_1000)), const_3600)