Answer: 
Step-by-step explanation:
Given
New mail carrier takes 4 hours for delivery i.e.
New mail carrier completes
part of work in 1 hour
Old mail carrier takes 3 hours for delivery i.e.
mail carrier completes
part of work in 1 hour
If they work together, they complete the work in x hours i.e.

Answer:
for every rise of 1 the run would be 25
Answer:
Pretty sure neither of them work. So prolly the last one. Hope I’m right :)
Answer:
What are the possible answers.
Step-by-step explanation: