if two - third of a bucket is filled in 90 seconds then the time taken to fill the bucket completely will be .
"2 / 3 filled in 90 seconds 1 / 3 filled in 45 seconds then 2 / 3 + 1 / 3 = 90 + 45 seconds = 135 seconds answer : c"
multiply(divide(90, const_2), const_3)