a train 275 m long , running with a speed of 90 km / hr will pass a tree in
"sol . speed = ( 90 x 5 / 18 ) m / sec . = 25 m / sec . time taken = ( 275 x 1 / 25 ) sec = 11 sec answer a"
multiply(divide(275, multiply(90, const_1000)), const_3600)