Abus on a regular schedule takes 3 1/4 hours to reach its destination. the express bus takes 2 1/2 hours to make the same trip. how much travel time can be saved by taking the express?

a. 2 hours
b. 5 3/4 hour
c. 1 1/4 hours
d. 3/4 hours

To find this answer, we should subtract 2 1/2 from 3 1/4. The simplest way to do this is to turn them into improper fractions, found the least common denominator, and subtract the numerators.

3 1/4=13/4
2 1/2=5/2

The least common multiple is 4, so we should multiply the numerator and denominator of 5/2 by 2.

5/2=10/4

Now we can just subtract the numerators.

13/4-10/4=3/4

Using the math above, we can see that it saves D. 3/4 hours.