Question

Sam walks for $\frac{3}{5}$ minutes and Tom walks for $\frac{7}{8}$ minutes.
So, Tom walks for minutes more.

• A. $\frac{10}{40}$
• B. $\frac{15}{40}$
• C. $\frac{11}{40}$
• D. $\frac{21}{40}$

Answer 1

The correct option is C $\frac{11}{40}$

Sam walks for $\frac{3}{5}$ min while Tom walks for $\frac{7}{8}$ min.

We can see that the denominators of the fractions are different.
To subtract one from other, we have to make the denominators same.



So, Tom walks more by:
$=\frac{7}{8}-\frac{3}{5}$ min
$=\frac{7\times 5-3\times 8}{40}$ min
$=\frac{35-24}{40}$ min
$=\frac{11}{40}$ min