Subtract 7/100 from 12/100. Remember, with like fractions, only subtract the numerators. The denominator stays the same. 12÷100 - 7÷100 = 5÷100. Reduce 5/100 to lowest terms. Using the GCF of 5, 5/100 = 1/20. Marta's time was thus ______ seconds faster than Todd's.