Answer:
B.
Step-by-step explanation:
Trust me.
I just did it.
3/5 + 5/7 = 1 11/35 - 1/5 = 1 4/35 which is your final answer.
You can figure out how many miles per hour it travels by dividing 18/3. This gives us the answer of 6. 3/4 = 0.75 so we can multiply 6 * 0.75 to get 4.5 as our final answer. It will travel 4.5 miles in 3/4 of an hour.
