a train 280 m long , running with a speed of 36 km / hr will pass a tree in
"sol . speed = ( 36 x 5 / 18 ) m / sec . = 10 m / sec . time taken = ( 280 x 1 / 10 ) sec = 28 sec answer d"
multiply(divide(280, multiply(36, const_1000)), const_3600)