Given that 2
Jessica swing a lap in 29 ------------- seconds .
5
Marta swings in 2. 8 seconds .
We have Jessica time in mixed fraction and Marta time in decimals .
We first covert mixed fraction into improper .
2 29 * 5 + 2 145 + 2 147
29 -------- = ------------------ = ------------------ = -------------
5 5 5 5
147
Thus Jessica time is ------------ .
5
Converting Marta time into fractions .
There is decimal . We have 2.8 seconds .
28
2.8 = -------------- .
10
We have two fractions with different denominator .
One is having denominator 5 and another is having denominator 10 .
We need to make the denominator same of both the fractions .
Multiply first fraction (147/5) by 2 in both numerator and denominator to make the denominator 10 .
It become
147 * 2 294
----------- = ----------------
5 * 2 10
Thus we get denominator of both the fractions same .
Jessica time is 294/10 and Marta time is 28/10 seconds .
Marta taking less time . She is faster .
Difference
294 28 266
------ - ------------- = ----------- seconds .
10 10 10
Converting to decimal , we get 26.6 seconds .
Marta is faster by 26.6 seconds .